Guide:Polterghast strategies

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PolterghastPhase 1
AI TypePolterghast AI
Damage150 / 240 / 300 / 345 (Contact)
120 / 192 / 240 / 276 (Blue Phantom Shot)
140 / 240 / 300 / 345 (Blue Phantom Blast)
Max Life412,500 / 660,000 /
792,000 / 1,056,000
Defense (DR)150 (10% DR)
KB Resist100%
Inflicts debuffHorrorHorror
100% chance
Debuff duration5 seconds (Contact)
Debuff tooltipThe horror...
Immune toAll debuffs except:
Ichor (debuff)Cursed InfernoAbyssal FlamesDemon FlamesGod Slayer InfernoNightwitherShredShellfish ClapsEnraged
Polterghast map.png
Map Icon
NecroghastPhase 2
AI TypePolterghast AI
Damage180 / 288 / 360 / 414 (Contact)
130 / 212 / 265 / 304 (Red Phantom Shot)
150 / 260 / 325 / 373 (Red Phantom Blast)
Max Life309,275 / 412,500
495,000 / 660,000
594,000 / 792,000
792,000 / 1,056,000
Defense (DR)100 (15% DR)
KB Resist100%
Inflicts debuffHorrorHorror
100% chance
Debuff duration5 seconds (Contact)
Debuff tooltipThe horror...
Immune toAll debuffs except:
Ichor (debuff)Cursed InfernoAbyssal FlamesDemon FlamesGod Slayer InfernoNightwitherShredShellfish ClapsEnraged
NecroplasmPhase 3
AI TypePolterghast AI
Damage210 / 336 / 420 / 483 (Contact)
Max Life136,125 / 412,500
217,800 / 660,000
396,000 / 792,000
528,000 / 1,056,000
Defense (DR)0 (20 or 80% DR)
KB Resist100%
Inflicts debuffHorrorHorror
100% chance
Debuff duration5 seconds (Contact)
Debuff tooltipThe horror...
Immune toAll debuffs except:
Ichor (debuff)Cursed InfernoAbyssal FlamesDemon FlamesGod Slayer InfernoNightwitherShredShellfish ClapsEnraged
Coins5 Platinum Coin

Polterghast is usually the seventh Post-Moon Lord boss that you will face in your playthrough. Polterghast is summoned by using the Necroplasmic Beacon in the Dungeon at any time. Additionally, if Polterghast is not yet defeated in a world, it will spawn naturally after killing 30 Phantom Spirits.

This guide will mention items exclusive to Expert and Revengeance Mode with no special formatting and will follow the intended progression.

Terrain Preparation[edit | edit source]

A large area in the Dungeon should be cleared out. There should be plenty of room to move. The arena should not have any places where you can get stuck; the floor and walls should be flat. Zen Potions help immensely while building the arena by preventing enemy spawns.

Gearing Up[edit | edit source]

Armor[edit | edit source]

Tarragon armor is the preferred choice for all classes. However, Lunar armors are likely still effective.

Accessories[edit | edit source]

  • Tarragon Wings (with Angel Treads) or Seraph Tracers are the preferred wings.
  • The Elysian Aegis or the Statis' Ninja Belt allow the player to make sharp turns and are very useful.
    • The Elysian Aegis additionally gives knockback immunity and many defensive boosts.
    • Statis' Ninja Belt additionally provides the chance of a ninja dodge, increased jump acceleration, and boosts to rogue.
  • The Absorber is important for survivability by increasing damage reduction as well as giving increased jump acceleration.
  • The Community is a great all around accessory that boosts offensive and defensive stats as well as boosting flight time.
  • The Heart of the Elements provides many all-around boosts including damage, damage reduction, life regen, and jump acceleration.
  • The Deific Amulet is an excellent option providing additional immunity frames and defense penetration.
  • The Astral Arcanum is a great option giving a chance to nullify projectile damage.
  • Melee players should use the Bloody Worm Scarf for its strong melee boosts as well as increased damage reduction.
  • Ranged players should use the Sniper Scope or Daedalus Emblem, which both help in boosting damage output.
    • The Daedalus Emblem additionally gives some life regen and ammo conservation.
  • Magic players should use the Sigil of Calamitas for its strong magic boosts.
  • Summoners can boost their minion count and damage with the Statis' Blessing and Statis' Curse.
  • Rogue users will find the Statis' Ninja Belt useful to boost their damage output in addition to the aforementioned boosts.

Weapons[edit | edit source]

The weapons made from Uelibloom Bars or Bloodstone Cores are typically the best options for the fight.

Melee[edit | edit source]

  • The True Tyrant's Ultisword's high DPS should make the fight fairly straight-forward for Melee users, as the short range is mitigated by Polterghast generally staying close to the player.
  • The Mirror Blade, typically in conjunction with the Mana Flower is another option with good DPS provided that you have good aim.
  • The Lacerator is a strong option that additionally provides a bit of healing to the player.
  • The Mutilator, Holy Collider, and Stellar Striker are risky options that deal great damage at the cost of losing lots of health.

Ranged[edit | edit source]

Mage[edit | edit source]

  • Sanguine Flare and Mistlestorm are excellent choices that deal high damage to Polterghast.
  • Viscera is a lower DPS option, but it greatly increases survivability with its healing.
  • The Elemental Ray and the Last Prism are decent choices dealing good damage to both Polterghast and its clone.
  • Everglade Spray is an excellent secondary weapon for applying Ichor for long periods of time.

Summoner[edit | edit source]

  • Cosmilamps are the primary weapon that deals immense damage being able to handle both the Polterghast and its clone.
  • The Energy Staff provides additional DPS to aid your minions.

Rogue[edit | edit source]

  • The Cosmic Kunai is Rogue's strongest option that deals excellent damage although it can be a bit risky.
  • Molten Amputators are another option that deal great DPS if Polterghast is lead through the boomerangs.
  • Shattered Sun is a great option with its homing, particularly in Phase 3 where it can hit both Polterghast and the clone at the same time.

Miscellaneous[edit | edit source]

  • Farm Blood Orbs to easily craft many helpful potions that will increase your survivability.
  • If in multiplayer, Wormhole Potions are a cheap and effective tool to escape death.

The Fight[edit | edit source]

Polterghast will spawn off-screen, meaning you should be prepared to dodge the Polterghast as it approaches you. Polterghast has 3 phases.

Phase 1 should be largely treated like Plantera. Slowly circle Polterghast and watch out for the hooks and bouncing projectiles.

At 75% health, Polterghast transforms into Necroghast (Phase 2). The hooks no longer deal contact damage, but instead they occasionally shoot at you. Necroghast's projectiles are now red, faster, and deal more damage. Continue circling the boss in this phase.

At 33% / 50%, Necroghast transforms into Necroplasm (Phase 3). It is highly recommended to use a weapon that inflicts Ichor in this phase such as Everglade Spray or the Golden Gun. At the start of this phase, Necroplasm immediately summons a clone. While this clone is alive, Necroplasm's damage reduction is increased by 30%, drastically reducing the damage it takes. It is always important to prioritize killing the clone. Once the clone is dead, Necroplasm gains a significant speed boost and will summon another one after 10 seconds. Additionally, Phantoms begin to revolve around the player. At set intervals, they release Spirit orbs that can deal a lot of damage. It is important to keep an eye on when they shoot, so as to not get caught off guard. Unlike prior phases, circling is much less effective in this phase. Walking away slowly tends to work the best although very wide circles can work as well. Occasionally, the clone will make very fast lunges toward the player. Necroplasm can also do this when the clone is dead. It is important to always keep moving and be ready to teleport with the Rod of Discord or Normality Relocator. When reaching 20% / 33% health, Necroplasm begins to occasionally summon Happy Phantom Spirits. Up to 3 can be summoned at a time. As long as you keep moving, they typically do not pose too much of a threat. Utilizing their Banner can minimize the threat they pose.

Be careful not to enter the Surface as it will cause Polterghast to enrage. When enraged, Polterghast gains a massive boost in speed, damage, projectile speed and fire rate, and damage reduction.

General Tips[edit | edit source]

  • The Normality Relocator is a very strong tool as it allows instantaneous teleporting.
    • Additionally, in Revengeance Mode, having the Relocator in your inventory will prevent you from taking 50% more damage while Chaos State is active.
    • Be wary when teleporting as the player will fall at a much greater pace if unprepared in a similar manner to the Portal Gun.
  • In Revengeance or Death Mode, Rage and Adrenaline can be used effectively to deal with the Polterghast Clone that spawns in Phase 3.
  • In Revengeance or Death Mode, the Horror debuff can be prevented with Margarita or Laudanum.
  • Everglade Spray can also be used to apply Ichor for other classes such as Rogue.
    • Everglade Spray activates the Summoner nerf. As such, Golden Gun should be used to apply Ichor instead.