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EnvironmentSnow biomeIce biome
DamageThis attack will cause defense damage on hit. 60 / 138 Expert Mode / 161 Revengeance Mode / 184 Death Mode / 276 Master Mode (Contact)
52 / 92 Expert Mode / 112 Revengeance Mode / 124 Death Mode / 168 Master Mode (Ice Blast)
60 / 100 Expert Mode / 120 Revengeance Mode / 132 Death Mode / 180 Master Mode (Ice Shard)
This attack will cause defense damage on hit. 120 Expert Mode / 136 Revengeance Mode / 152 Death Mode / 210 Master Mode (Ice Bomb)
Max Life30,000 / 48,000 Expert Mode / 57,600 Revengeance Mode / 72,000 Master Mode / 86,400 Revengeance Mode Master Mode
KB Resist100%
Immune toConfusedPearl AuraGlacial StateExo FreezeFrostburn
Coins 40 Gold Coin.png
Cryogen map.png
Map Icon

Cryogen Trophy.png "The archmage's prison." Cryogen Trophy.png

Cryogen is a Hardmode boss that can be fought in the Snow or Ice biomes which possesses many phases and features a multitude of projectiles and enemies.

Defeating Cryogen will free the Archmage, as well as generate Cryonic Ore in the Ice biome.


Cryogen does not spawn on its own and requires the player to summon it with a Cryo Key while in the Snow biome or Ice biome at any time.


Cryogen has six phases, each of which has its own attack pattern and AI. It will progress through these phases as it loses health.

Cryogen also spawns with an ice shield which protects it and inflicts contact damage; this shield must be destroyed to directly attack Cryogen and will regenerate 18 / 12 Expert Mode / 9 Death Mode seconds after being destroyed.

Leaving the Snow biome will cause Cryogen to enrage, almost doubling its speed and acceleration.


Phase 1

  • Slowly chases and levels with the player.
  • Fires an evenly-spaced ring of 16 Ice BlastIce Blasts every 2 seconds.

Phase 2

  • Transitions at 80 / 85% Revengeance Mode health.
  • Attempts to fly above the player while continuing to fire bursts of Ice BlastIce Blasts.
    • The amount of Ice Blasts are reduced from 16 to 12 from this phase onwards.
  • After firing 3 bursts of Ice Blasts, briefly spins in place before charging at the player and firing two concentric rings of ten Ice Blasts before flying up and resuming its pattern.

Phase 3

  • Transitions at 60% / 70% Revengeance Mode health.
  • Slowly chases the player but stays slightly below the player.
  • After firing 3 bursts of Ice Blasts, briefly spins in place before charging at the player and fires three concentric rings of eight Ice Blasts. Cryogen performs this charge twice before resuming its pattern.

Phase 4

  • Transitions at 40% / 55% Revengeance Mode health.
  • Slowly chases the player.
  • Loses the ability to regenerate its shield.
  • Fires Ice BlastIce Blasts at double the frequency.
  • Every 5 seconds, Cryogen will teleport somewhere near the player and start attacking again.
    • The location it teleports to is surrounded by a cloud of blue dust two seconds prior to telegraph its location.

Phase 5

  • Transitions at 30% / 45% Revengeance Mode / 50% Death Mode health.
  • Stops firing either projectiles for the remainder of the fight.
  • Rapidly and loosely accelerates towards the player, charging at them when it gets close.
    • Its rotation speed will increase when below 5% / 7.5% Revengeance Mode and even further when below 2.5% / 5% Revengeance Mode / 30% Death Mode health.

In Expert Mode

  • Regenerates its shield every 12 seconds instead of 18.
  • Every 10 seconds, Cryogen releases a burst of 3 Ice BombIce Bombs. After these bombs hit tiles or 5 seconds pass, they explode into a hexagonal burst of 2 Expert Mode / 3 Revengeance Mode gravity-affected Ice RainIce Shards.
    • This occurs in all of the above phases alongside other attacks.
    • Velocity of the Ice Shards increases with every phase, and the number of Ice Shards created increases by 1 every 2 phases.
    • Ice Bombs are smaller and cannot hurt the player or inflict status effects for the first 2 seconds after they're spawned.
    • They also inflict Glacial State for 1 second, Chilled for 1.5 seconds, and Frostburn for 2 seconds on contact.

In Revengeance Mode

  • Transitions into Phase 2 at 85% health, Phase 3 at 70%, Phase 4 at 55%, and Phase 5 at 45%.
  • Cryogen and its projectiles are slightly faster.
  • Gains a new phase when below 25% Revengeance Mode health:
    • Attempts to hover above the player.
    • The Ice BombIce Bomb attack no longer occurs every 10 seconds. Instead, a set of Ice Bombs is spawned every 1.25 seconds while hovering.
    • It will also begin spawning 2 Ice BlastIce Blasts with a weak homing effect at certain intervals.
    • After spawning 2 sets of projectiles, it rapidly charges the player 3 times before repeating this pattern. While it will only spawn Ice Bombs during it's dedicated attack, it can spawn homing Ice BlastIce Blasts during the ends of its dashes as well.
    • Below 15% Revengeance Mode health, its appearance will change one last time and its charges will each each fire three concentric rings of Ice Blasts.
      • The outer and center rings have four Ice Blasts, while the center ring has eight.

In Death Mode

  • Transitions into Phase 2 immediately instead of 85%.
  • Transitions into Phase 3 at 80% health instead of 70%.
  • Transitions into Phase 4 at 60% health instead of 55%.
  • Transitions into Phase 5 at 50% health instead of 45%.
  • Transitions into Phase 6 at 35% health instead of 25%.
  • Transitions into Phase 7 at 25% health instead of 15%.
  • Time to respawn Cryogen's Shield reduced from 12 seconds to 9.
  • Cryogen's Shield is 20% smaller and only has 700 health instead of 1400.

During the Boss Rush

  • Releases more Ice BlastIce Blasts during the whole fight.

On the For the worthy seed

  • Cryogen is 20% smaller.
  • Cryogen's Shield automatically gains its 80% size modifier from Death Mode.
  • Charges more frequently.


Cryogen's Shield
Cryogen's Shield.png
TypeFlying Enemy
EnvironmentSnow biome
DamageThis attack will cause defense damage on hit. 60 / 120 Expert Mode / 138 Revengeance Mode / 158 Death Mode / 216 Master Mode (Contact)
52 / 92 Expert Mode / 112 Revengeance Mode / 124 Death Mode / 168 Master Mode (Ice Blast)
Max Life1400 / 2100 Master Mode
KB Resist100%
Inflicts debuffFrostburnFrostburn
100% chance
Debuff duration1.5 seconds
Debuff tooltipIt's either really hot or really cold. Either way it REALLY hurts
Inflicts debuffChilledChilled
100% chance
Debuff duration1 second
Debuff tooltipYour movement speed has been reduced
Inflicts debuffFrozenFrozen
100% chance
Debuff duration0.5 seconds (Ice Blast)
Debuff tooltipYou can't move!
Immune toConfusedPearl AuraGlacial StateExo FreezeFrostburn


  • Once Cryogen is defeated for the first time, Cryonic Ore spawns in the Ice biome.
  • If at least two mechanical bosses have been defeated, Cryo Slimes will begin to spawn in the Ice biome.
  • The Archmage will begin to arrive if provided suitable housing.
    • If the Archmage isn't in the player's current world, he will drop alongside Cryogen's loot.
  • The Rimehound enemy's stats are increased and will start dropping Essence of Eleum.


  • While Cryogen is alive, the sky above the player is filled with a waving rainbow aurora effect. Unlike most screen effects from other bosses, it cannot be toggled off by lighting options in the Settings Menu.
  • Cryogen's projectiles are colored deep blue during the day and white at night.
  • All Ice Shards/Blasts are fired in fixed patterns throughout the fight.
    • In the case of Ice Bombs, two spreads of three Ice Shards are fired when they explode, one in each direction parallel to the direction the Ice Bomb was moving.
  • Cryogen will not fire projectiles if it does not have a direct line of sight to the player, with the exception of Ice Bombs. All of Cryogen's projectiles are also unable to travel through blocks.
  • If Cryogen is close to the player when it enters Phase 5, it will briefly spin in place to give the player time to get away from its dash.


For more elaborate strategies on defeating Cryogen, including weapon and arena recommendations, see Guide:Cryogen strategies.
  • It is easier to see Cryogen's projectiles during the night.
  • A wide arena with several levels of platforms can help in dodging Cryogen's attacks.
    • Putting a roof of solid blocks above the platforms can help protect you during Cryogen's second phase.
    • Be careful: Building platforms too far above the ground could cause the player to exit the Snow biome and enrage Cryogen.
  • Moving at a constant speed will cause Cryogen to hover in the same place relative to the player, making it an easy target for ranged weapons.
    • Moving slowly enough will cause Cryogen to hover directly above the player, this makes it very easy to hit, but be wary of its ice bombs and it potentially getting up close.
  • Avoid getting hit by Cryogen's Ice Blasts at all costs as they will freeze the player, possibly leading to a swift death.
  • Cryogen's final phase is one of its most deadly. If on Revengeance or Death Mode, saving Rage and/or Adrenaline to quickly finish it off during this phase could be a life-saving decision.
  • While Cryogen is fought as the first boss in Hardmode, caution is still advised as the fast speed and many projectiles will make this boss tough for an unprepared player.
  • In multiplayer, Cryogen does not despawn when off-screen and moves slowly across the map, allowing players to slowly kill the boss.


  • The BestiaryBestiary entry for Cryogen: "A prismatic living ice crystal. Though typically glimpsed only through the harsh sleet of blizzards, on the rare days where it is seen during a sunny day, its body gleams a deadly, beautiful blue."
  • Cryogen's theme is Antarctic Reinforcement, which was composed by the artist DM DOKURO.
    • While in production the theme was originally intended to be called "Frostbite."
    • If the Calamity Music add-on mod is disabled, the Frost Moon's theme will play instead.
  • Cryogen was previously an alternative for The Destroyer because of its previous ability to drop Souls of Might.
  • Cryogen is often fought at the start of Hardmode, as its summoning item only requires Souls of Light and Night, and Ice Blocks.
  • Originally, every time upon entering phase 6, a status message would say "Cryogen is derping out!".
    • There is now a 1% (5% if the day is April Fools' Day) chance that this message is displayed when entering phase 6.
  • If the Boss Checklist Mod is installed, its unique despawn message will be "Cryogen drifts away, carried on a freezing wind."