Corpse Thief Hare is a spirit in BLACKSOULS 2 you can find at a certain part of the Slaughterhouse area. He’s an interesting spirit to fight because after a certain point in the fight, he will summon his weird assistant who’s also demented as much as he is.
He has a ton of health, the ability to heal himself, and a furious phase where he gets stronger. His assistant is really annoying, talking to them both is very interesting though.
Killing him will get you the Resurrectionist’s Ring, and two Black Souls.