Ragged Caster

Ragged Casters are an enemy that can rarely be found in the dungeon during Hardmode. Their attack is somewhat similar to the dark caster but much quicker and instead of "Water Sphere" They appear to shoot "Lost Souls". They are immune to the Poisoned and Venom debuffs and only spawn in dungeons with a Slab Wall. They also apply Blackout.

Trivia
The Blackout Debuff they apply could be a reference to Metal Gear Solid on PS1 with the Psycho Mantis battle