not much is known about them, all we found was this diary that read...
"A man, literally created from the embodinent of hatred, insanity, and corruption.."
"they wouldn't stop killing us, and no matter how many times it was killed, erased, defeated, or even wiped from existence...it ALWAYS came back"
"NOTE: it will dev0ur the opponent's body after defeating them"
"-always smiling...loves pain.."