Ancient Doom

"Ancient Doom is one of the Lunatic Cultist's attacks and will only appear when the boss is at relatively low health (<50%). A short time after creation or upon death, the Ancient Doom will burst and send slow-moving projectiles in all four cardinal directions. These projectiles pierce, cannot be destroyed by weapons, and do high damage upon hitting a target. Due to the large amount of Ancient Dooms created by the boss whenever the attack is used, this is a very dangerous attack and care should be taken when avoiding them."