Ancient Doom

Ancient Doom is one of the Lunatic Cultist's attacks in Expert Mode and Master Mode. It will only appear when the boss is at relatively low health (Less than 50%). A short time after creation or upon death, the Ancient Doom will burst and send slow-moving "Prophecy's End" projectiles in all four cardinal directions. These projectiles pierce and cannot be destroyed by weapons, and they deal significantly high amounts of damage, especially in Master Mode.

Trivia

 * Despite having the hurt sound of a Zombie or any type of Slime, it has the kill sound of a Ghost or Wraith.
 * Another two enemies that follow this pattern, with a different hurt sound to the kill sound, are the Possessed Armor and Mimics.