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Polterghast's hooks can travel further between latches.This includes their red versions in later phases.The rate Polterghast fires Phantom Shots and Phantom Blasts is increased.Polterghast's velocity and acceleration are greater in all three phases.When below 5% / 10% / 15% / 20% health, Necroplasm begins to move more quickly as a last-ditch effort to attack the player, and will also stop summoning Happy Phantom Spirits.When below 10% / 20% / 35% / 45% health, Necroplasm begins summoning up to 2 Happy Phantom Spirits, which also fire ghostly projectiles at the player.The Phantoms cannot shoot Phantom Mines while Necroplasm is charging.If the clone has been killed, Necroplasm charges 4 times instead, and its charges are much faster.While glowing, the clone positions itself on the other side of Necroplasm and charges up to 3 times in tandem with Necroplasm.Additionally, it fires a spread of 6 Shots every 7 seconds. Necroplasm moves significantly faster and deals even more contact damage.The chains reappear and the hooks no longer shoot projectiles. Necroplasm's hooks move slower and less often.Both the Clone and the Phantoms can be killed however, killing the clone will increase Necroplasm's aggression.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. Upon entering Phase 3, Necroplasm summons a clone of itself, as well as 3 Phantoms.Transforms into Necroplasm at 20% / 35% / 50% / 60% health.Necroghast charges a second time while it is glowing red.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 moves more quickly and deals more contact damage.
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Necroghast's hooks detach from their chains, and they begin independently moving and shooting ghostly projectiles at the player.Transforms into Necroghast at 50% / 65% / 80% / 90% health.Polterghast periodically stops shooting projectiles and glows red, positioning itself diagonally to the player before charging at them once.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 follows a Plantera-like behavior, placing its hooks on nearby walls to quickly pull itself towards the player.If they remain on the surface for over 10 seconds, Polterghast will accelerate away and despawn. If the player travels to the Surface, Polterghast will enrage, gaining a speed boost until they return. Its projectiles' speed and rate of fire are also affected by these boosts. 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. 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. 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 behaves similarly to Plantera, chasing the player quickly while using four long appendages to grapple blocks. After defeating it once, using a Necroplasmic Beacon becomes the only way to summon the boss. 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. Polterghast can be summoned by using a Necroplasmic Beacon in the Dungeon.