Polterghast

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PolterghastPhase 1
Polterghast.png
Statistics
TypeBoss
EnvironmentDungeon
DamageThis attack will cause defense damage on hit. 150 / 240 Expert Mode / 264 Revengeance Mode / 280 Death Mode / 384 Master Mode (Contact)
140 / 240 Expert Mode / 264 Revengeance Mode / 280 Death Mode / 396 Master Mode (Blue Phantom Shot)
This attack will cause defense damage on hit. 150 / 264 Expert Mode / 288 Revengeance Mode / 300 Death Mode / 432 Master Mode (Blue Phantom Blast)
Max Life350,000 / 560,000 Expert Mode /
672,000 Revengeance Mode / 840,000 Master Mode / 1,008,000 Revengeance Mode Master Mode
Defense90
DR15%
KB Resist100%
Inflicts debuffMoon BiteMoon Bite
100% chance
Debuff duration15 seconds (Contact)
Debuff tooltipYou are unable to absorb healing effects
Inflicts debuffNightwitherNightwither
100% chance
Debuff duration2 seconds (Blue Phantom Shot and Blast)
Debuff tooltipIncinerated by lunar rays
Immune toConfusedPearl AuraNightwitherWhispering Death
NecroghastPhase 2
Necroghast.png
Statistics
TypeBoss
EnvironmentDungeon
DamageThis attack will cause defense damage on hit. 180 / 288 Expert Mode / 316 Revengeance Mode / 336 Death Mode / 460 Master Mode (Contact)
150 / 264 Expert Mode / 288 Revengeance Mode / 300 Death Mode / 432 Master Mode (Red Phantom Shot)
This attack will cause defense damage on hit. 160 / 276 Expert Mode / 304 Revengeance Mode / 320 Death Mode / 456 Master Mode (Red Phantom Blast)
Max Life175,000 / 350,000
364,000 / 560,000 Expert Mode
537,600 / 672,000 Revengeance Mode
604,800 / 672,000 Death Mode
546,000 / 840,000 Master Mode
806,400 / 1,008,000 Revengeance Mode Master Mode
907,200 / 1,008,000 Death Mode Master Mode
Defense72
DR20%
KB Resist100%
Inflicts debuffMoon BiteMoon Bite
100% chance
Debuff duration15 seconds (Contact)
Debuff tooltipYou are unable to absorb healing effects
Inflicts debuffWhispering DeathWhispering Death
100% chance
Debuff duration2 seconds (Red Phantom Shot and Blast)
Debuff tooltipDeath approaches; movement speed, attack power and life regen reduced
Immune toConfusedPearl AuraNightwitherWhispering Death
NecroplasmPhase 3
Necroplasm.png
Statistics
TypeBoss
EnvironmentDungeon
DamageThis attack will cause defense damage on hit. 210 / 336 Expert Mode / 369 Revengeance Mode / 392 Death Mode / 537 Master Mode (Contact)
Max Life70,000 / 350,000
196,000 / 560,000 Expert Mode
336,000 / 672,000 Revengeance Mode
403,200 / 672,000 Death Mode
294,000 / 840,000 Master Mode
504,000 / 1,008,000 Revengeance Mode Master Mode
604,800 / 1,008,000 Death Mode Master Mode
Defense45
DR50%
KB Resist100%
Inflicts debuffMoon BiteMoon Bite
100% chance
Debuff duration15 seconds (Contact)
Debuff tooltipYou are unable to absorb healing effects
Immune toConfusedPearl AuraNightwitherWhispering Death
Drops
Coins 3 Platinum Coin.png 50 Gold Coin.png
Sounds
Necroplasm map.png
Map Icon
Not to be confused with Poltergeist, a vanilla enemy.

Long-dead prisoners seek their zealous revenge...

Polterghast is a post-Moon Lord boss that can be fought in the Dungeon. While it is optional, it is highly recommended to fight it before challenging The Devourer of Gods.

Defeating Polterghast will provide the player with Ruinous Souls, a material used to craft powerful equipment. Additionally, mini bosses in the Abyss will begin dropping weapons upon its defeat, and the final tier of the Acid Rain event will become unlocked.

Summoning

Polterghast can be summoned by using a Necroplasmic Beacon in the Dungeon. Alternatively, if it has not yet been defeated in the world, it will spawn after killing 30 Phantom Spirits, which can be found in the Dungeon after Moon Lord has been defeated. After defeating it once, using a Necroplasmic Beacon becomes the only way to summon the boss.

Behavior

Polterghast behaves similarly to Plantera, chasing the player quickly while using four long appendages to grapple blocks. In the second phase, however, these appendages will detach and begin firing projectiles independently, before re-attaching in the final phase as Polterghast summons an unbound clone of itself.

Polterghast will receive a boost to its speed depending on the size of the arena it is fought in, which is determined by the amount of active tiles in an area around it. If the arena is smaller it will move slower, and if the arena is larger it will move faster, proportional to the lack of blocks. Its projectiles' speed and rate of fire are also affected by these boosts.

If the player travels to the Surface, Polterghast will enrage, gaining a speed boost until they return. If they remain on the surface for over 10 seconds, Polterghast will accelerate away and despawn.

Phase 1 (Polterghast)

  • Polterghast follows a Plantera-like behavior, placing its hooks on nearby walls to quickly pull itself towards the player.
  • Polterghast alternates between moving slowly while firing a spread of 5 slow, cyan coloured Phantom Shots and moving more quickly while firing a spread of 4 fast, homing Phantom Blasts that move through blocks.
  • Polterghast periodically stops shooting projectiles and glows red, positioning itself diagonally to the player before charging at them once.
  • Transforms into Necroghast at 50% / 65% Expert Mode / 80% Revengeance Mode / 90% Death Mode health.

Phase 2 (Necroghast)

  • Necroghast's hooks detach from their chains, and they begin independently moving and shooting ghostly projectiles at the player.
  • Necroghast moves more quickly and deals more contact damage.
  • Necroghast begins firing a spread of 5 Potent Phantom Shots or Blasts, which are red projectiles that travel faster, further, and deal slightly more damage.
  • Necroghast charges a second time while it is glowing red.
  • Transforms into Necroplasm at 20% / 35% Expert Mode / 50% Revengeance Mode / 60% Death Mode health.

Phase 3 (Necroplasm)

  • Upon entering Phase 3, Necroplasm summons a clone of itself, as well as 3 Phantoms. The clone behaves similar to Necroplasm, staying within the hooks and alternating with Necroplasm in chasing the player, while the Phantoms orbit Necroplasm and occasionally fire Phantom Mines that gradually accelerate over time.
    • Both the Clone and the Phantoms can be killed; however, killing the clone will increase Necroplasm's aggression.
  • Necroplasm's hooks move slower and less often. The chains reappear and the hooks no longer shoot projectiles.
  • Necroplasm moves significantly faster and deals even more contact damage. Additionally, it fires a spread of 6 Shots every 7 seconds.
  • While glowing, the clone positions itself on the other side of Necroplasm and charges up to 3 times in tandem with Necroplasm.
    • If the clone has been killed, Necroplasm charges 4 times instead, and its charges are much faster.
    • The Phantoms cannot shoot Phantom Mines while Necroplasm is charging.
  • When below 10% / 20% Expert Mode / 35% Revengeance Mode / 45% Death Mode health, Necroplasm begins summoning up to 2 Happy Phantom Spirits, which also fire ghostly projectiles at the player.
  • When below 5% / 10% Expert Mode / 15% Revengeance Mode / 20% Death Mode health, Necroplasm begins to move more quickly as a last-ditch effort to attack the player, and will also stop summoning Happy Phantom Spirits.

In Expert Mode

  • Polterghast's velocity and acceleration are greater in all three phases.
  • The rate Polterghast fires Phantom Shots and Phantom Blasts is increased.
    • This includes their red versions in later phases.
  • Polterghast's hooks can travel further between latches.
  • In its third phase, Necroplasm summons three invincible Phantoms which slowly revolve around itself. The Phantoms fire phantom orb mines which are initially slow, but quickly accelerate toward the player.
    • The phantom orb mines will not deal damage until they reach maximum velocity.

In Revengeance Mode

  • Polterghast's velocity and acceleration are even greater in all three phases.
  • Transitions into Phase 3 (Necroplasm) at 50% health instead of 33%.
  • Spawns Happy Phantom Spirits at 33% health instead of 20%.
  • Moves much faster at 10% health instead of 5% health.
  • Phantoms shoot more often.

In Death Mode

  • Transitions into Phase 2 (Necroghast) at 90% health instead of 80%.
  • Transitions into Phase 3 (Necroplasm) at 60% health instead of 50%.
  • Moves much faster at 25% health instead of 10% health.
  • Phantoms Spirits shoot at an even higher frequency.
  • Gains velocity and acceleration as HP decreases.
  • Can hook increased distances as HP decreases.
  • Hooks fire faster and more often as HP decreases.

On the For the worthy seed

  • Charges twice as frequently.
  • Phantoms fire twice as fast and orbit at triple speed.

Summons

Polterghast Hook
Polterghast Hook.png
Statistics
TypeEnemy
EnvironmentDungeon
Damage0 (Contact)
140 / 240 Expert Mode / 264 Revengeance Mode / 280 Death Mode / 396 Master Mode (Hook Shot)
Max Life50,000
Defense50
KB Resist0% / 10% Expert Mode / 20% Master Mode
Inflicts debuffNightwitherNightwither
100% chance
Debuff duration2 seconds (Phantom Shot)
Debuff tooltipIncinerated by lunar rays
Immune toAll debuffs except:
EnragedShellfish ClapsSpite
PolterghastClone
Polterghast (Clone).png
Statistics
TypeFlying Enemy
EnvironmentDungeon
DamageThis attack will cause defense damage on hit. 210 / 336 Expert Mode / 360 Revengeance Mode / 392 Death Mode / 528 Master Mode
Max Life35,000 / 72,000 Expert Mode / 120,000 Revengeance Mode / 144,000 Death Mode / 108,000 Master Mode / 180,000 Revengeance Mode Master Mode / 216,000 Death Mode Master Mode
Defense45
DR10%
KB Resist100%
Inflicts debuffMoon BiteMoon Bite
100% chance
Debuff duration6 seconds (Contact)
Debuff tooltipYou are unable to absorb healing effects
Immune toAll debuffs except:
EnragedKami FluShellfish ClapsSpite
Phantom
Phantom.png
Statistics
TypeFlying Enemy
EnvironmentDungeon
Damage0 (Contact)
This attack will cause defense damage on hit. 170 / 296 Expert Mode / 324 Revengeance Mode / 340 Death Mode / 462 Master Mode (Phantom Mine)
Max Life8,750 / 11,250 Expert Mode / 18,750 Revengeance Mode / 22,500 Death Mode / 22,500 Master Mode / 37,500 Revengeance Mode Master Mode / 45,000 Death Mode Master Mode
Defense45
DR10%
KB Resist100%
Immune toAll debuffs except:
EnragedShellfish ClapsSpite
Image Name Condition
Happy Phantom Spirit Happy Phantom Spirit Phase 3

Aftermath

Notes

  • Polterghast moves faster if it is currently inside tiles.
  • Polterghast checks for arena size by constantly scanning a 40x40 rectangular area around itself (1600 blocks total). If there are less than 800 active tiles in that area, it will move faster proportional to the lack of blocks.
    • The duration of its projectiles will also increase along with the speed boost. The Phase 3 clone will speed up as well.

Tips

For more elaborate strategies on defeating Polterghast, including weapon and arena recommendations, see Guide:Polterghast strategies.
  • Polterghast has similar AI to Plantera, which means that movement strategies used during that boss fight may work here as well.
  • Slowing down and observing how Polterghast behaves shortly before each of its telegraphed dashes would help dodging it, as the boss will only dash diagonally from where it's positioning itself relative to the player.
    • For phase 3 especially, dodging towards an axis parallel to where Polterghast and its clone line up would make dodging both a lot easier.
  • Don't rush too much when fighting its last form. The chaotic activity can easily overwhelm the player if they're careless. Take your time and be careful when dodging.
  • Polterghast can be fought before any post-Moon Lord boss is defeated, although it is highly recommended to wait until Providence and the Sentinels of the Devourer are defeated. Polterghast's high speed, damage, and projectiles can easily overwhelm an unprepared player.

Trivia

  • The BestiaryBestiary entry for Polterghast: "Screaming and crying, a cacophony of spirits in anguish tear through the narrow hallways of the dungeon, searching for more—alive or dead—to add to their numbers."
  • Polterghast's theme is Feral Amalgamation, which was made by the artist DM DOKURO.
    • If the Calamity Music add-on mod is disabled, Plantera's theme will play instead.
    • Polterghast’s theme used to be Ruin, a remix of "In the Hall of the Mountain King" from the game The End is Nigh.
  • Polterghast's clone in Phase 3 was inspired by Pontiff Sulyvahn, a boss from the game Dark Souls III.
  • The boss's multiple names are the result of a disagreement between the boss's spriter, LordMetarex, and the lead developer, Fabsol/MountainDrew. The spriter was naming his files ‘Necroplasm’ and was using it as the official name for the boss. During a spoiler, the official name was revealed to be ‘Polterghast’. After an argument the developer decided to use ‘Polterghast’ for the first phase and ‘Necroplasm’ for the last phase. ‘Necroghast’, being a combination of the two names, was used for phase two.
  • Polterghast can be summoned after the Moon Lord is defeated, as its summoning item only requires Spooky Wood and Phantoplasm.
  • In Polterghast's second and third phases, the Boss Health Bar displays the name of the phase followed by "the Polterghast", similarly to how Town NPC names are displayed in Status messages.
  • If the Boss Checklist Mod is installed, its unique despawn message will be "The volatile spirits disperse throughout the depths of the dungeon."
  • In the mod's source files, Phantoms are referred to as 'PhantomFuckYou'.