Exo Mechs

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Exo Mechs
Exo Mechs.png
Statistics
TypeBoss
Max Life3,460,000 / 5,536,000 Expert Mode / 6,624,000 Revengeance Mode / 8,304,000 Master Mode / 9,936,000 Revengeance Mode Master Mode (total)
KB Resist100%
If you were looking for something other than the boss, see Draedon (disambiguation).

The Exo Mechanical Trio (Lore).png "The fruits of masterful craftsmanship and optimization, created only with the objective to destroy." The Exo Mechanical Trio (Lore).png

The Exo Mechs are a group of post-Moon Lord bosses that can be fought simultaneously after defeating Jungle Dragon, Yharon, and intended to be fought around the same time as Supreme Calamitas. The battle consists of a passive Draedon along with the four Exo Mechs: XS-01 Artemis, XS-03 Apollo, XM-05 Thanatos, and XF-09 Ares. They are currently one of the most challenging bosses in the Calamity Mod.

Defeating them will provide the player with Exo Prisms, a crafting material for various endgame equipment.

Spawn

The Exo Mechs do not spawn on their own, and require the player to construct The Codebreaker with a Decryption Computer and an Auric Quantum Cooling Cell. Once constructed, the player can interact (right-click) and press the Contact button. The Exo Mechs can be fought in any biome at any time.

Once summoned, Draedon will allow the player to choose an Exo Mech that will be spawned first.

  • Thanatos Selection Icon Thanatos, a serpentine terror with impervious armor and innumerable laser turrets.
  • Ares Selection Icon Ares, a heavyweight, diabolical monstrosity with four Exo superweapons.
  • Artemis and Apollo Selection Icon Artemis and Apollo, a pair of extremely agile destroyers with pulse cannons.

Bosses

Ares

XF-09 AresBody
XF-09 Ares.png
Statistics
TypeBoss
Damage0 (Contact)
This attack will cause defense damage on hit. 300 / 508 Expert Mode / 528 Revengeance Mode / 544 Death Mode / 780 Master Mode (Exo Overload Beam)
Max Life1,250,000 / 2,000,000 Expert Mode / 2,392,000 Revengeance Mode / 3,000,000 Master Mode / 3,588,000 Revengeance Mode Master Mode
Defense100
DR35%
KB Resist100%
Inflicts debuffOn Fire!On Fire!
100% chance
Debuff duration6 seconds (Exo Overload Beam)
Debuff tooltipSlowly losing life
Inflicts debuffFrostburnFrostburn
100% chance
Debuff duration6 seconds (Exo Overload Beam)
Debuff tooltipIt's either really hot or really cold. Either way it REALLY hurts
Immune toConfusedPearl Aura
XF-09 Ares Gauss Nuke
XF-09 Ares Gauss Nuke.png
Statistics
TypeBoss
Damage0 (Contact)
This attack will cause defense damage on hit. 400 / 608 Expert Mode / 640 Revengeance Mode / 658 Death Mode / 960 Master Mode (Gauss Nuke)
200 / 304 Expert Mode / 320 Revengeance Mode / 329 Death Mode / 480 Master Mode (Gauss Spark)
Max Life1,250,000 / 2,000,000 Expert Mode / 2,392,000 Revengeance Mode / 3,000,000 Master Mode / 3,588,000 Revengeance Mode Master Mode
Defense80
DR35%
KB Resist100%
Inflicts debuffOn Fire!On Fire!
100% chance
Debuff duration8 seconds (Gauss Explosion)
3 seconds (Gauss Spark)
Debuff tooltipSlowly losing life
Immune toConfusedPearl Aura
XF-09 Ares Laser Cannon
XF-09 Ares Laser Cannon.png
Statistics
TypeBoss
Damage0 (Contact)
300 / 508 Expert Mode / 528 Revengeance Mode / 544 Death Mode / 780 Master Mode (Exothermal Laser)
This attack will cause defense damage on hit. 240 / 408 Expert Mode / 432 Revengeance Mode / 456 Death Mode / 630 Master Mode (Red Exo Pulse Laser)
Max Life1,250,000 / 2,000,000 Expert Mode / 2,392,000 Revengeance Mode / 3,000,000 Master Mode / 3,588,000 Revengeance Mode Master Mode
Defense80
DR35%
KB Resist100%
Inflicts debuffBrimstone FlamesBrimstone Flames
100% chance
Debuff duration5 seconds (Exothermal Laser)
3 seconds (Red Exo Pulse Laser)
Debuff tooltipRapid health loss
Immune toConfusedPearl Aura
XF-09 Ares Plasma Cannon
XF-09 Ares Plasma Cannon.png
Statistics
TypeBoss
Damage0 (Contact)
This attack will cause defense damage on hit. 240 / 408 Expert Mode / 432 Revengeance Mode / 456 Death Mode / 630 Master Mode (Volatile Plasma Blast)
This attack will cause defense damage on hit. 192 / 324 Expert Mode / 346 Revengeance Mode / 365 Death Mode / 504 Master Mode (Exoplasma Bolt)
Max Life1,250,000 / 2,000,000 Expert Mode / 2,392,000 Revengeance Mode / 3,000,000 Master Mode / 3,588,000 Revengeance Mode Master Mode
Defense80
DR35%
KB Resist100%
Inflicts debuffOn Fire!On Fire!
100% chance
Debuff duration6 seconds (Volatile Plasma Blast)
3 seconds (Exoplasma Bolt)
Debuff tooltipSlowly losing life
Inflicts debuffCursed InfernoCursed Inferno
100% chance
Debuff duration3 seconds (Volatile Plasma Blast)
1.5 seconds (Exoplasma Bolt)
Debuff tooltipLosing life
All damage taken increased by 20%
Immune toConfusedPearl Aura
XF-09 Ares Tesla Cannon
XF-09 Ares Tesla Cannon.png
Statistics
TypeBoss
Damage0 (Contact)
240 / 408 Expert Mode / 432 Revengeance Mode / 456 Death Mode / 630 Master Mode (Tesla Sphere)
Max Life1,250,000 / 2,000,000 Expert Mode / 2,392,000 Revengeance Mode / 3,000,000 Master Mode / 3,588,000 Revengeance Mode Master Mode
Defense80
DR35%
KB Resist100%
Inflicts debuffElectrifiedElectrified
100% chance
Debuff duration4 seconds (Tesla Sphere)
Debuff tooltipMoving hurts!
Immune toConfusedPearl Aura

Artemis and Apollo

XS-01 ArtemisFirst Phase
XS-01 Artemis.png
Statistics
TypeBossFlying Enemy
DamageThis attack will cause defense damage on hit. 300 / 480 Expert Mode / 512 Revengeance Mode / 528 Death Mode / 660 Master Mode (Charge)
This attack will cause defense damage on hit. 240 / 408 Expert Mode / 432 Revengeance Mode / 456 Death Mode / 630 Master Mode (Orange Exo Pulse Laser)
Max Life1,250,000 / 2,000,000 Expert Mode / 2,392,000 Revengeance Mode / 3,000,000 Master Mode / 3,588,000 Revengeance Mode Master Mode
Defense80
DR25%
KB Resist100%
Inflicts debuffBrimstone FlamesBrimstone Flames
100% chance
Debuff duration3 seconds (Orange Exo Pulse Laser)
Debuff tooltipRapid health loss
Immune toConfusedPearl Aura
XS-03 ApolloFirst Phase
XS-03 Apollo.png
Statistics
TypeBossFlying Enemy
DamageThis attack will cause defense damage on hit. 240 / 408 Expert Mode / 432 Revengeance Mode / 456 Death Mode / 630 Master Mode (Large Volatile Plasma Blast)
This attack will cause defense damage on hit. 192 / 324 Expert Mode / 346 Revengeance Mode / 365 Death Mode / 504 Master Mode (Exoplasma Bolt)
This attack will cause defense damage on hit. 280 / 476 Expert Mode / 484 Revengeance Mode / 500 Death Mode / 726 Master Mode (High Explosive Plasma Rocket)
Max Life1,250,000 / 2,000,000 Expert Mode / 2,392,000 Revengeance Mode / 3,000,000 Master Mode / 3,588,000 Revengeance Mode Master Mode
Defense80
DR25%
KB Resist100%
Inflicts debuffOn Fire!On Fire!
100% chance
Debuff duration6 seconds (Large Volatile Plasma Blast, High Explosive Plasma Rocket)
3 seconds (Exoplasma Bolt)
Debuff tooltipSlowly losing life
Inflicts debuffCursed InfernoCursed Inferno
100% chance
Debuff duration3 seconds (Large Volatile Plasma Blast, High Explosive Plasma Rocket)
1.5 seconds (Exoplasma Bolt)
Debuff tooltipLosing life
All damage taken increased by 20%
Immune toConfusedPearl Aura
XS-01 ArtemisSecond Phase
XS-01 Artemis (Phase 2).png
Statistics
TypeBossFlying Enemy
DamageThis attack will cause defense damage on hit. 240 / 408 Expert Mode / 432 Revengeance Mode / 456 Death Mode / 630 Master Mode (Orange Exo Pulse Laser)
This attack will cause defense damage on hit. 300 / 508 Expert Mode / 528 Revengeance Mode / 544 Death Mode / 780 Master Mode (Orange Exothermal Beam)
Max Life750,000 / 1,250,000
1,200,000 / 2,000,000 Expert Mode
1,435,200 / 2,392,000 Revengeance Mode
1,800,000 / 3,000,000 Master Mode
2,152,800 / 3,588,000 Revengeance Mode Master Mode
Defense80
DR25%
KB Resist100%
Inflicts debuffBrimstone FlamesBrimstone Flames
100% chance
Debuff duration5 seconds (Orange Exothermal Beam)
3 seconds (Orange Exo Pulse Laser)
Debuff tooltipRapid health loss
Immune toConfusedPearl Aura
XS-03 ApolloSecond Phase
XS-03 Apollo (Phase 2).png
Statistics
TypeBossFlying Enemy
DamageThis attack will cause defense damage on hit. 320 / 512 Expert Mode / 544 Revengeance Mode / 560 Death Mode / 696 Master Mode (Charge Combo)
This attack will cause defense damage on hit. 240 / 408 Expert Mode / 432 Revengeance Mode / 456 Death Mode / 630 Master Mode (Large Volatile Plasma Blast)
This attack will cause defense damage on hit. 192 / 324 Expert Mode / 346 Revengeance Mode / 365 Death Mode / 504 Master Mode (Exoplasma Bolt)
This attack will cause defense damage on hit. 280 / 476 Expert Mode / 484 Revengeance Mode / 500 Death Mode / 726 Master Mode (High Explosive Plasma Rocket)
Max Life750,000 / 1,250,000
1,200,000 / 2,000,000 Expert Mode
1,435,200 / 2,392,000 Revengeance Mode
1,800,000 / 3,000,000 Master Mode
2,152,800 / 3,588,000 Revengeance Mode Master Mode
Defense80
DR25%
KB Resist100%
Inflicts debuffOn Fire!On Fire!
100% chance
Debuff duration6 seconds (Large Volatile Plasma Blast, High Explosive Plasma Rocket)
3 seconds (Exoplasma Bolt)
Debuff tooltipSlowly losing life
Inflicts debuffCursed InfernoCursed Inferno
100% chance
Debuff duration3 seconds (Large Volatile Plasma Blast, High Explosive Plasma Rocket)
1.5 seconds (Exoplasma Bolt)
Debuff tooltipLosing life
All damage taken increased by 20%
Immune toConfusedPearl Aura

Thanatos

XM-05 Thanatos Head
XM-05 Thanatos Head.png
Statistics
TypeBossFlying Enemy
Burrowing Enemy
DamageThis attack will cause defense damage on hit. 350 / 560 Expert Mode / 592 Revengeance Mode / 608 Death Mode / 756 Master Mode (Contact)
This attack will cause defense damage on hit. 350 / 592 Expert Mode / 624 Revengeance Mode / 656 Death Mode / 780 Master Mode (Gamma Disintegration Beam)
Max Life960,000 / 1,536,000 Expert Mode / 1,840,000 Revengeance Mode / 2,304,000 Master Mode / 2,760,000 Revengeance Mode Master Mode
Defense80
DR99.99% / 0%
KB Resist100%
Inflicts debuffBrimstone FlamesBrimstone Flames
100% chance
Debuff duration6 seconds (Gamma Disintegration Beam)
Debuff tooltipRapid health loss
Immune toAll debuffs except:
EnragedShellfish ClapsSpite
XM-05 Thanatos Body
XM-05 Thanatos Body.png
Statistics
TypeBossFlying Enemy
Burrowing Enemy
DamageThis attack will cause defense damage on hit. 300 / 480 Expert Mode / 512 Revengeance Mode / 528 Death Mode / 660 Master Mode (Contact)
This attack will cause defense damage on hit. 240 / 408 Expert Mode / 432 Revengeance Mode / 456 Death Mode / 630 Master Mode (Red Exo Pulse Laser)
Max Life960,000 / 1,536,000 Expert Mode / 1,840,000 Revengeance Mode / 2,304,000 Master Mode / 2,760,000 Revengeance Mode Master Mode
Defense100
DR99.99% / 0%
KB Resist100%
Inflicts debuffBrimstone FlamesBrimstone Flames
100% chance
Debuff duration3 seconds (Red Exo Pulse Laser)
Debuff tooltipRapid health loss
Immune toAll debuffs except:
EnragedShellfish ClapsSpite
XM-05 Thanatos Tail
XM-05 Thanatos Tail.png
Statistics
TypeBossFlying Enemy
Burrowing Enemy
DamageThis attack will cause defense damage on hit. 250 / 400 Expert Mode / 424 Revengeance Mode / 440 Death Mode / 552 Master Mode (Contact)
This attack will cause defense damage on hit. 240 / 408 Expert Mode / 432 Revengeance Mode / 456 Death Mode / 630 Master Mode (Red Exo Pulse Laser)
Max Life960,000 / 1,536,000 Expert Mode / 1,840,000 Revengeance Mode / 2,304,000 Master Mode / 2,760,000 Revengeance Mode Master Mode
Defense120
DR99.99% / 0%
KB Resist100%
Inflicts debuffBrimstone FlamesBrimstone Flames
100% chance
Debuff duration3 seconds (Red Exo Pulse Laser)
Debuff tooltipRapid health loss
Immune toAll debuffs except:
EnragedShellfish ClapsSpite

Behavior

The Exo Mechs fight consists of 7 phases total.

  • Phase 1: The first mech chosen is fought until it reaches 70% health.
  • Phase 2: The first mech chosen disappears, and the other two appear. This phase continues until one of the mechs reaches 70% health.
  • Phase 3: The first mech reappears and all three mechs will be present. While in this phase, all mechs are slightly slower or perform less attacks. This phase continues until one of the mechs reaches 40% health, in which it goes into a berserk state and gains new attacks.
  • Phase 4: The mech at the lowest health battles the player on its own, until it is defeated.
  • Phase 5: The mech with the higher remaining health returns to battle the player on its own until it reaches 70% health. Then, both surviving mechs fight the player until one of the mechs reaches 40% health. If both remaining mechs were already at 70% health, they will reappear simultaneously.
  • Phase 6: The mech at the lower health battles the player on its own, until it is defeated.
  • Phase 7: The last remaining mech battles the player with significantly increased speed and aggression, and will instantly go berserk regardless of its health.

Ares

Ares initially spawns with four limbs: the Laser Cannon to the upper far left, Tesla Cannon to lower left, Plasma Cannon to the lower right, and Gauss Nuke to the upper far right. These share the same health pool with Ares, thus damaging any of the weapons will also damage the main health bar itself. For most of the battle, Ares and its arms will hover above the player, and will not deal contact damage.

Body

  • The body normally follows above the player and does not have an attack until it reaches its berserk state.
  • When berserk, the boss will have an idle time of 10 seconds before performing an attack, 7 seconds if it is the last mech alive.
  • Its only attack in its berserk state is to lock in place, detach the weapons from the arms to create an X-formation, and mark areas around the core with 6 / 8 Expert Mode / 9 Revengeance Mode / 10 Death Mode lines. While performing this attack, all projectiles that the weapons have shot previously are destroyed. After 2.5 / 2 Expert Mode / 1.75 Revengeance Mode / 1.5 Death Mode seconds, the lines turn into solid Exo Overload Beams which spin around clockwise or counterclockwise for 10 seconds, with the speed of the spin increasing over the duration of the attack.
    • All weapons except Gauss Nuke will still function during this attack, although many attacks are modified.
    • If the player exits the range of the lasers by moving 155 tiles away, Ares will temporarily enter an enraged state until the next Exo Overload Beam attack, causing the boss and its arms to glow red, and causing its body and weapons to emit steam. In this state, all body parts will have their DR increased from 35% to 85% and attack significantly faster, and the idle time of the body also decreases by 25%.

Laser Cannon

  • The Laser Cannon normally aims at the player when performing no attacks. It idles for 7.5 seconds before attacking.
    • The idle duration is reduced by 50% when berserk, 70% if it is the last mech alive, and 90% if enraged.
  • When attacking, it glows and starts pulsing rapidly, aims straight downwards or parallel to the ground, and charges up a laser for 2.4 seconds, signified by a line telegraph. This is followed up with a charge-up sound 1.67 seconds before firing.
    • The cannon will always aim down at first, and will alternate in direction after every fire.
  • Then, it fires a stationary Exothermal Laser in the targeted direction and the cannon sweeps towards the player for 1 second before returning to the original position.
    • The arm velocity decreases by 50% if Artemis and Apollo are present.
  • If Ares is performing the Exo Overload Beam attack, the charge-up sound does not play, and the cannon shoots 2 Red Exo Pulse LaserRed Exo Pulse Lasers at the player over a second duration.
    • The lasers travel in a line which is telegraphed before the cannon fires.
    • The number of lasers increases to 3 if it is the last mech alive, and 9 if enraged.
  • Both laser attacks have increased velocity if the boss is in the berserk state, further if it is the last mech alive, and even further if enraged.

Tesla Cannon

  • The Tesla Cannon normally aims significantly ahead of the player when performing no attacks. It idles for 3.5 seconds before attacking, 2 seconds if Ares is performing the Exo Overload Beam attack.
    • The idle duration is reduced by 30% when berserk, 60% if it is the last mech alive, and 90% if enraged.
    • The idle duration will be offset by 1.33 seconds when Ares first spawns, and 0.38 seconds when Ares reappears following a phase transition.
    • Predictiveness increases by 50% if it is the last mech alive, decreases by 50% if Artemis and Apollo are present, and decreases by 75% if all three mechs are alive.
  • When attacking, the cannon glows and rapidly pulses for 2.4 seconds before firing a chain of 4 connecting Tesla SphereTesla Spheres over the duration of 2 seconds. The connecting arc snaps if orbs are over 60 / 75 Expert Mode / 80 Revengeance Mode / 85 Death Mode tiles away from each other.
    • If Ares is performing the Exo Overload Beam attack, the orb terminal speed is halved and all connecting arcs are instantly snapped.
    • The orb count is reduced to 3 if Artemis and Apollo are present, 5 if berserk, 6 if enraged.
    • If all three mechs are alive, the orb velocity decreases.
    • The orb velocity increases if the boss is in the berserk state, further if it is the last mech alive, and even further if enraged.

Plasma Cannon

  • The Plasma Cannon normally aims moderately ahead of the player when performing no attacks. It idles for 3.5 seconds before attacking, 2 seconds if Ares is performing the Exo Overload Beam attack.
    • The idle duration is reduced by 30% when berserk, 60% if it is the last mech alive, and 90% if enraged.
    • The idle duration will be offset by 4.33 seconds when Ares first spawns, and 4.1 seconds following a phase transition.
    • Predictiveness decreases by 50% if Artemis and Apollo are present, and 75% if all three mechs are present.
  • When attacking, the cannon glows and rapidly pulses for 2.4 seconds before firing 2 Volatile Plasma BlastVolatile Plasma Blasts over the duration of 2 seconds. The blast will explode into a ring of 8 accelerating Exoplasma BoltExoplasma Bolts 2 seconds after launch or upon collision with tiles.
    • The blast count is increased to 3 if it is the last mech alive.
    • If all three mechs are alive, the blast velocity decreases.
    • The blast velocity increases if the boss is in the berserk state, further if it is the last mech alive, and even further if enraged.
    • If other mechs are present or Ares is performing the Exo Overload Beam attack, the amount of bolts spawned on the blast explosion will be halved.

Gauss Nuke

  • The Gauss Nuke normally aims slightly ahead of the player when performing no attacks. It idles for 12.5 seconds before attacking.
    • The idle duration is reduced by 85% when berserk, 90% if it is the last mech alive, and 95% if enraged.
    • Predictiveness decreases by 50% if Artemis and Apollo are present, and 75% if all three mechs are present.
  • After glowing and rapidly pulsing for 3.6 seconds, a homing Gauss NukeGauss Nuke is fired along with a ring of 12 gravity-affected Gauss SparkGauss Sparks.
    • The nuke homes in towards the player until it is 20 / 18.75 Expert Mode / 18.125 Revengeance Mode / 17.5 Death Mode tiles away, upon which it continues travelling in that direction, and will explode into a massive shockwave 3 seconds after launch or upon collision with tiles.
    • The blast radius of the nuke is approximated by a translucent green circle around the projectile.
    • The pulse telegraph time is halved if the boss is enraged.
    • The nuke velocity increases if the boss is in the berserk state, further if it is the last mech alive, and even further if enraged.
  • While the nuke launches, Ares reloads another nuke within the span of 6 seconds.
    • The reload time is halved if the boss is enraged.

Artemis and Apollo

Artemis and Apollo initially spawn to the left and right of the player respectively. They will remain around those positions for most of the battle, with frequent small movement and infrequent charges towards the player; if all three of the Exo Mechs are currently active, they will position themselves 22.5 tiles lower than usual. The two entities share a health pool, thus damaging Apollo will also damage Artemis and vice versa. Upon reaching 60% health, both bosses transition into the second phase, ejecting their lenses and revealing their pulse cannons.

Artemis

  • Relocates slightly, then fires an Orange Exo Pulse LaserOrange Exo Pulse Laser at the player every 0.75 seconds.
    • The relocation range is random and varies in a range of 3.125 tiles horizontally and 15.625 tiles vertically, halved if all three mechs are present.
    • The lasers travel in a line which is telegraphed half a second before appearing.
    • The timer is decreased to 0.58 seconds if it is the last mech alive, or 1 second if any other mech is present.
    • Predictiveness decreases by 50% if one other mech is present, and 75% if all three mechs are present.
  • After 6.25 / 5.98 Expert Mode / 5.85 Revengeance Mode / 5.72 Death Mode seconds in the first phase, Artemis replaces its next normal attack with a large orange-red column that appears for 0.75 seconds, then fires a spread of 4 / 6 Expert Mode / 8 Death Mode Orange Exo Pulse LaserOrange Exo Pulse Lasers and launches in the telegraphed direction, returning to its original position after completing its charge.
    • This attack does not occur if all three mechs are alive.
    • The dash itself is the only time Artemis will deal contact damage.
  • After 6.5 / 6.23 Expert Mode / 6.1 Revengeance Mode / 5.97 Death Mode seconds in the second phase, Artemis will select between the Laser Shotgun Barrage or Exothermal Beam attacks, which will alternate each time.
    • The timer is decreased to 5 / 4.87 Expert Mode / 4.8 Revengeance Mode / 4.73 Death Mode seconds while berserk, and 4.25 / 4.12 Expert Mode / 4.05 Revengeance Mode / 3.98 Death Mode seconds if it is the last mech alive.
    • This attack does not occur if all three mechs are alive.
    • For the Laser Shotgun Barrage attack, Artemis fires two consecutive bursts of 6 / 7 Expert Mode / 8 Death Mode Orange Exo Pulse LaserOrange Exo Pulse Lasers over a duration of 1.5 seconds.
      • Lasers are 1.5x more predictive than normal.
      • If Apollo performs the Charge Combo attack, the amount of lasers is reduced by 2. Otherwise if it is the last mech alive, the amount of lasers is increased by 2.
      • If it is the last mech alive, Artemis instead fires three bursts in 2 seconds.
    • For the Exothermal Beam attack, Artemis positions itself above the player and remains in place for one second, aiming a line in its forward direction. Then, it fires the Orange Exothermal beam straight ahead and spins around the set position for 3 seconds while sustaining the beam.

Apollo

  • Relocates slightly, then fires a Large Volatile Plasma BlastLarge Volatile Plasma Blast at the player every 0.75 seconds.
    • The relocation range is random and varies in a range of 3.125 tiles horizontally and 15.625 tiles vertically, halved if all three mechs are present.
    • Blasts explode into 4 Exoplasma BoltExoplasma Bolts after 1 second.
    • The timer is decreased to 0.67 seconds if it is the last mech alive, or 1 second if any other mech is present.
  • After 6.5 / 6.23 Expert Mode / 6.1 Revengeance Mode / 5.97 Death Mode seconds in the first phase, Apollo fires three High Explosive Plasma RocketHigh Explosive Plasma Rockets over a duration of 1.5 seconds.
    • Each time Apollo fires, it will relocate with half the normal range.
    • Each rocket homes in towards the player until it is 15 / 12.5 Expert Mode / 11.25 Revengeance Mode / 10 Death Mode tiles away where it continue travelling in that direction. Additionally, rockets also push other nearby rockets away from each other.
    • If any other mech is alive, Apollo instead fires two rockets. If it is the last mech alive, the duration decreases from 1.5 to 1 second.
  • After 6.5 / 6.23 Expert Mode / 6.1 Revengeance Mode / 5.97 Death Mode seconds in the second phase, Apollo will select between the Rocket Barrage or the Charge Combo attack, which will alternate each time.
    • The timer is decreased to 5 / 4.87 Expert Mode / 4.8 Revengeance Mode / 4.73 Death Mode seconds while berserk, and 4.25 / 4.12 Expert Mode / 4.05 Revengeance Mode / 3.98 Death Mode seconds if it is the last mech alive.
    • This attack does not occur if all three mechs are alive.
    • For the Charge Combo attack, Apollo lines up a series of three charges in a horizontal zig-zag pattern pointed at the player for 1 / 0.83 Expert Mode / 0.75 Revengeance Mode / 0.67 Death Mode seconds, then dashes quickly along the telegraphed path.
      • At the start of each charge, Apollo releases a ring of 8 Exoplasma BoltExoplasma Bolts outwards.
      • After performing all the charges, Apollo returns to its original position.
      • The dash itself is the only time Apollo will deal contact damage.

Thanatos

Thanatos initially spawns far below the player, and is composed of 102 segments. All its segments including the head and tail are effectively immune to damage. However, body and tail segments will occasionally open up, emitting steam, pulsing red, as well as appearing red on the minimap. While red, a segment's damage reduction drops to zero, in addition to taking 40% / 30% Expert Mode / 25% Revengeance Mode / 20% Death Mode more damage; if berserk, it will only take 10% / 7.5% Expert Mode / 5% Revengeance Mode / 2.5% Death Mode more damage. Thanatos' open segments must have at least 3 / 2 Death Mode closed segments between them, which decreases to 1 if berserk.

Regardless of the type of attack, open segments always fire at each individual player in multiplayer, up to a maximum of 3 players at a time. If segments are at least 150 tiles away from the player, they will not fire until the player is back in range. After firing, segments will remain vulnerable for 3 seconds before closing. The time taken to close the vulnerable segment reduces to 2 seconds if berserk, 1 second if it is the last mech alive.

  • Thanatos flies below the player for 6 seconds, taking 1.5 seconds to open up 20 / 25 Expert Mode / 28 Revengeance Mode / 30 Death Mode segments which simultaneously fire two Red Exo Pulse LaserRed Exo Pulse Lasers, one laser aimed ahead of the player and the other aimed behind them. It then begins to fly alongside the player as if passive; every 0.05 seconds, a segment opens up, which individually fires two Red Exo Pulse Lasers at the nearest player after 0.6 seconds, using the same aiming mechanism as the previous lasers. This continues until the attack is complete, or 20 / 25 Expert Mode / 28 Revengeance Mode / 30 Death Mode segments have fired.
    • The number of segments that can fire at the same time decreases if at least one other mech is active, and no longer has a limit if berserk.
    • If all three mechs are active, simultaneous lasers will not be fired and the lasers aimed behind the player will be omitted.
    • If berserk, one additional laser is fired from each segment which is aimed directly at the player.
    • The time taken to open a segment is decreased to 0.033 seconds if berserk, 0.017 if it is the last mech alive.
    • The attack lasts 5 seconds if berserk, 4.5 seconds if it is the last mech alive.
  • Thanatos charges at the player for 7 seconds, speeding up at the first 6 seconds and slowing down for the last second. During this time, it opens up a large number of its segments which will all simultaneously fire Red Exo Pulse LaserRed Exo Pulse Lasers at the nearby player after 0.6 seconds. Following this, several available segments will also open, firing single Red Exo Pulse Lasers directly at the player.
    • This attack does not occur if all three mechs are alive.
    • The number of segments that can fire at the same time decreases if at least one other mech is active, and no longer has a limit if berserk.
    • Thanatos turns slower the closer it is to the target. It begins turning slower if it is 15 tiles from the player, 10 if it is the last mech alive.
    • Speed up time decreases to 4 seconds if berserk, 3 seconds if it is the last mech alive.
    • Slow down time decreases to 0.67 seconds if berserk, 0.5 seconds if it is the last mech alive.
  • Once berserk, it is able to replace every other burrow attack with a new attack. In the attack, Thanatos places a crosshair on the player and tracks the location for three seconds, while firing a harmless converging ray. After three seconds, the rays fully materialize into a Gamma Disintegration Beam that fires two perpendicular rows of Red Exo Pulse LaserRed Exo Pulse Lasers outwards every 2.67 / 1.33 Expert Mode seconds. The beam lasts for 3 seconds before disappearing, causing Thanatos to immediately switch to the charge attack.
    • While performing this attack, the head itself becomes vulnerable and has vulnerable properties such as emitting steam and glowing red. It is also set to take 10% more damage regardless of difficulty.
    • Thanatos will drastically slow down once the player is in a 62.5 / 50 Expert Mode / 43.75 Revengeance Mode / 37.5 Death Mode tile radius to the head; this reduces to 37.5 / 30 Expert Mode / 26.25 Revengeance Mode / 22.5 Death Mode if it is the last mech alive. The crosshair lock-on visual will also become looser the closer the player is to Thanatos' head.
    • The rows of lasers have a gap of 20 / 18 Revengeance Mode / 16 Death Mode tiles and deal as much damage as the Gamma Disintegration Beam itself.

In Expert Mode

  • Ares: Has a 50% chance to swap its arms after performing the Exo Overload Beams attack. Increased projectile velocity of all four weapons. Tesla Cannon, Plasma Cannon, and Gauss Nuke become more predictive. Tesla Spheres connect from a further distance. Gauss Nuke tracks the player more closely. Exo Overload Beams are telegraphed for less time.
  • Artemis/Apollo: Artemis gains the ability to align below the player when performing the Exothermal Beam attack, and rotates the beam more. Both Artemis and Apollo have faster attacks, more predictiveness, and take less time to perform special attacks. Increased the number of lasers fired by Artemis during the Laser Shotgun Barrage attack. Apollo's rockets have greater homing speed and stronger anti-clump push.
  • Thanatos: Moves faster, slow down at a closer distance to the player, can have more segments open at once, takes less damage from open segments, and fires lasers with greater predictiveness.

In Revengeance Mode

  • Ares: Is guaranteed to swap its arms after performing the Exo Overload Beams attack. Further increased projectile velocity of all four weapons. Tesla Cannon, Plasma Cannon, and Gauss Nuke become even more predictive. Tesla Spheres connect from an even further distance. Gauss Nuke tracks the player even more closely. Exo Overload Beams are telegraphed for even less time.
  • Artemis/Apollo: Both are now capable of swapping locations between phases and charges. Artemis gains the ability to align to the left or right of the player when performing the Exothermal Beam attack, and rotates the beam more. Both Artemis and Apollo have faster attacks, more predictiveness, and take less time to perform special attacks. Apollo's rockets have greater homing speed and stronger anti-clump push.
  • Thanatos: Moves faster, slows down at a closer distance to the player, can have more segments open at once, takes less damage from open segments, and fires lasers with greater predictiveness. It can fly upwards while performing the burrowing attack. Increased the number of lasers resulting from the Gamma Disintegration Beam.

In Death Mode

  • Ares: Further increased projectile velocity of all four weapons. Tesla Cannon, Plasma Cannon, and Gauss Nuke become even more predictive. Tesla Spheres connect from an even further distance. Gauss Nuke tracks the player more closely. Exo Overload Beams are telegraphed for less time.
  • Artemis/Apollo: Both of them have faster attacks, more predictiveness, and take less time to perform special attacks. Increased the number of lasers fired by Artemis during the Laser Shotgun Barrage attack, and it rotates the Exothermal Beam more. Apollo's rockets have greater homing speed and stronger anti-clump push.
  • Thanatos: Moves faster, slow down at a closer distance to the player, can have more segments open at once, takes less damage from open segments, and fires lasers with greater predictiveness. Increased the number of lasers resulting from the Gamma Disintegration Beam.

On the For the worthy seed

  • Ares: Releases 4 additional Exo Overload Beams. Gauss Nuke moves at double speed and last half as long. Red Exo Pulse Lasers move 25% faster.
  • Artemis/Apollo: Relocation range doubled, moves 50% faster, and charges 15% faster. Attack telegraphs last 50% shorter. Orange Exo Pulse Lasers move 25% faster. Apollo fires 3 additional rockets.
  • Thanatos: Slows down at a 50% closer distance to the player and moves 15% faster. Red Exo Pulse Lasers move 25% faster.

Resistances

  • Ares, its weapons, and all of Thanatos' vulnerable segments take reduced damage from most non-minion piercing projectiles. Each hit decreases the damage of the next hit by 12%, until the eighth hit onwards which deal 20% of original damage.
  • Ares, its weapons, and all of Thanatos' segments take 20% damage from grenade-type projectiles. A list of affected projectiles is below.
Resisted grenades
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Notes

  • Most drops from the Exo Mechs including weapons, masks, and trophies depend on the last Exo Mech defeated. Weapons and masks are permanently saved to the loot pool when defeated once, but will not stack with each other if the same Exo Mechs are defeated multiple times. However, trophies will always drop depending on the final mech killed and are not permanently saved.
    • For example, if the player defeats Thanatos last after defeating Ares last two times prior, Thanatos will be able to drop Ares Mask and Thanatos Mask at a 28.57% chance each, will be guaranteed to drop the Photon Ripper, The Jailor, Spine of Thanatos, and Refraction Rotor, and will drop the Thanatos Trophy at a 100% chance along with other common drops.
  • Thanatos does not take damage or deal contact damage in the first 5 and 3 seconds when initially spawned and reappearing in battle respectively.
  • Draedon exists as an NPC. However, he does not perform any attacks, instead moving away from the player to observe the battle. Once all Exo Mechs are defeated, he can be damaged during the closing monologue. "Killing" him will cause another invincible hologram of him to spawn, prompting an extra dialogue. He will continue the monologue as usual even after interrupted.
    • Draedon will take 56x damage from any sources and will cause all damage to turn into critical strikes. If the damage taken is somehow not enough to "kill" him, damage is increased to a range varying from 32,100 to 33,500 damage.
  • While any Exo Mechs are alive, the sky turns grey and lightning strikes occasionally occur in the background. Specific attacks of the Exo Mechs will also cause a set amount of lightning strikes to occur.
    • When Apollo is performing its Charge Combo attack, 10 lightning bolts appear.
    • When Artemis is performing its Exothermal Beam attack, 12 lightning bolts appear.
    • When Ares is performing the telegraph for its Exo Overload Beam attack, 12 lightning bolts appear.
    • When Ares' Gauss Nuke explodes, 12 lightning bolts appear.
    • When Thanatos is performing the telegraph for its Gamma Disintegration Beam attack, 12 lightning bolts appear.
  • Each individual Exo Mech will drop hearts when defeated.

Tips

For more elaborate strategies on defeating the Exo Mechs, including weapon and arena recommendations, see Guide:Exo Mechs strategies.
  • Unlike Supreme Calamitas, the lack of arena restrictions allows for the player to be well equipped for higher mobility to dodge most of the attacks. Due to the chaotic nature of the fight, it is heavily encouraged to create a wide-open space to move around in.
  • Due to the number of simultaneous threats active at any given time, peripheral awareness of one's surroundings is very important to keep track of any incoming projectiles.
  • Many of Ares' attacks deal especially massive damage and have a wide reach, so it is particularly important to predict which of its arms will attack next ahead of time. Watching which of Ares' arms are glowing can help prepare the player for an imminent attack.
  • Solid blocks in the arena, including a solid ground that is close to the player, are discouraged as they will cause Ares' Gauss Nuke to detonate earlier. However, blocks will protect the player from Ares' Exo Overload Beams and since no Gauss Nukes are shot while the attack is in progress, the player could hide under a barrier of blocks to avoid the attack, albeit with some room needed to dodge the other projectiles.
  • The God Slayer armor's dash ability, Rod of Discord, or the Normality Relocator are very useful tools for escaping certain situations that can lead to getting hit from a deadly attack such as Artemis' Orange Exothermal Beam, or to avoid a chain of hits.
  • As getting closer to Thanatos when it is firing its Gamma Disintegration Beam slows down its speed exponentially, it is advised for the player to stay as close as possible to the head when it is performing the attack. This will also remove the threat of being hit from the rows of Red Exo Pulse Lasers that release from the beam itself. Note that the player will still have to contend with the risk of Thanatos encircling the player during the attack or immediately after it ends.
  • Most of Artemis and Apollo's and Ares's attacks can be dodged using vertical movement. As such, equipments and buffs that boost flight time and speed are favored.
  • The Slimy Saddle or similar mounts can be used to accelerate fall speed and avoid attacks from Ares, along with Artemis and Apollo.
  • Moving away from Ares' Exo Overload Beam attack outside of the determined range will trivialize the attack. Although the player will have to deal with an increased damage reduction from the boss and enraged weapon attacks after, it remains as an option to dodge the attack easily if the player is having trouble with it. If the player decides to enrage, they should not return as the enrage cannot be undone until the attack cycle finishes.
  • Thanatos takes significantly higher damage from area of effect damage if multiple vulnerable segments are curled up in a small area.
  • It is much more beneficial to attack Ares' weapons rather than the body itself, as they have less defense and allow for multiple segments to be hit at once when fired in a line.

Trivia

  • The theme of the Exo Mechs is Inferior Fabrications, which was composed by PinpinNeon.
    • This however, is a placeholder. CDMusic has confirmed he will make the actual theme for Draedon and the Exo Mechs at a future date.
    • If the Calamity Music add-on mod is disabled, Boss 3 will play instead.
  • The designs of the Exo Mechs are based on the mechanical bosses. This can be reflected by the second letter in their names, which correspond to the soul drops of the predecessors.
  • The names of each Exo Mech are also the names of Greek gods and goddesses:
    • Artemis is the goddess of the hunt, the wild and the moon.
    • Apollo is the god of the sun, light and poetry - among other things.
    • Thanatos is the god of death.
    • Ares is the god of war.
    • Additionally, Apollo and Artemis are twins in Greek mythology, referenced by those names being used for the Exo Twins.
  • Ares' Exo Overload Beam attack is commonly referred to as the "Blender Attack", with the beams themselves being referred to as "Blenderbeam".
  • The Orange Exothermal Beam is referred to as the "Ohio Beam".
    • The attack is commonly called the "Ohio Attack" as an inside joke from beta testers. It originated from a meme of a bugged version of the attack in test versions.
  • The Gamma Disintegration Beam is referred to as the "T Hanos Beam".
    • Thanatos is also occasionally internally referred to as "T Hanos".
  • Thanatos' Gamma Disintegration Beam telegraph takes inspiration from the Prototype Railgun weapon from Enter the Gungeon.
  • Thanatos boasts 102 individual segments, making it one of the two longest bosses in the mod, the other being The Devourer of Gods' second phase.
  • Ares' design takes several elements from Gundams from the franchise of the same name, and Evangelions from Neon Genesis Evangelion.
    • Notably, its spiked helmet draws inspiration from the Gundams, and the shoulder pylons come from the ones present on the Evangelions. Its gores and trophy also fully expose its core which is similar to Evangelion Unit-01's core.
  • Ares' enrage when the player goes out of range of its Exo Overload Beam attack is a reference to a similar enrage used by Spamton NEO from the game, Deltarune, with both turning red, releasing smoke, and making an alarming noise. Both enrages are executed to prevent the player from exploiting their respective bosses.
  • Prior to the 1.5.1.001 update, all of the Exo Mechs used to be unable to take any damage from any attack that would deal more than 10% of their health in one hit, such as another mod's butcher function or an incredibly powerful weapon. When hit by such an attack, the damage of the attack would be reduced to 0.
  • Draedon's status messages have the color #9BFFFF ●.
  • If the Boss Checklist Mod is installed, their unique despawn message will be "An imperfection after all... what a shame."
    • If the Boss Despawn Message is set to Generic, the message for when every player is killed corresponds to the Exo Mech chosen at the start of the fight.

BestiaryBestiary entries

  • Draedon: "The esteemed scientist himself. His AI is uploaded into a database, far from harm, and thus destroying his recon bodies achieves nothing."
  • XF-09 Ares: "While it is the most flamboyant of Draedon’s machines, it appears to be lacking some finish, though this trait does not compromise its killing potential whatsoever."
  • XM-05 Thanatos: "Under every armored plate on this machine lies an advanced weapon. This sacrifices the machine’s durability, but it makes it a very effective mass murderer."
  • XS-01 Artemis: "The Exo Twins are the ultimate recon units. Capable of detecting various wavelengths of light unknown to us, nothing can hide."
  • XS-03 Apollo: "Within it, burns chemicals with the fury of Greek fire. Highly refined from the design of the eye-like twins before, it is now capable of outstanding mid-air movement."

Quotes

When Spawned

When Draedon is spawned for the first time

  • "I have waited long for this moment."
  • "Your nature fascinates me, for I do not understand it."
  • "You will face my creations which have surpassed gods."
  • "And you will show me your disposition through battle."
  • "Now, choose."

When Draedon is spawned in subsequent battles

  • "Make your choice."

In Battle

In Phase 2

  • "Designs improved with time and knowledge are the essence of my work."
  • "Through no other method can I approach perfection."

In Phase 3

  • "Your performance falls neatly within the margin of error."
  • "That is quite satisfactory. We will proceed to the next phase of testing."

In Phase 4

  • "Ever since I was alerted to your presence, I have processed your battles in order to make my machines stronger."
  • "Even now, I monitor your actions. Nothing should escape the bounds of my calculations."

In Phase 5

  • "Curious. Very curious."
  • "You progress steadily against more difficult challenges."

In Phase 6

  • "Your nature remains unknown to me. This will not do."
  • "...I sought perfection. Fate must favor irony, for that must have been my first mistake."

In Phase 7

  • "Absurd."
  • "I will no longer let my calculations impede my observation of this battle."
  • "I shall show you the full fury of my final machine."

When attempting to escape Ares' Exo Overload Beam attack

  • "How foolish. You cannot escape."

When Defeated

  • "An unknown factor - a catalyst is what you are."
  • "Nearly as alien as I, to this land and its history."
  • "...Excuse my introspection. I must gather my thoughts after that display."
  • "This land has become stale and stiff with blood that has been spilled until now."
  • "You have also spilled blood, but it may be enough to usher a new age... Of what, I do not know. But it is something I am eager to see."
  • "Now. You wish to reach the Tyrant. I cannot assist you in that."
  • "It is not a matter of spite, for I would wish nothing more than to observe such a conflict."
  • "But you have managed before. You will find a way eventually."
  • "I must acknowledge your triumph, but I will return now to my machinery."

When Draedon is attacked during his closing monologue

  • "...Quite unnecessary."