Ragged Caster

Ragged Casters are an enemy that can be found in the dungeon during Hardmode, after defeating Plantera. They attack in quick bursts, rapidly firing spectre bolts before teleporting. Unlike the other Hardmode dungeon casters, the Ragged Caster will not teleport immediately after being hit, much like the Dark Caster. They are immune to the Poisoned and Venom debuffs and only spawn in dungeons with a Slab Wall. They can also inflict Blackout Debuff.

Trivia
The blackout debuff they inflict could be a reference to Metal Gear Solid on PS1 with the Psycho Mantis battle