The real Epsilon is a lengendary beast called a Night Stalker. He's a werewolf like creature that's the size of a horse when on all fours and stands about two times taller than the average male when standing. he is destructive and evil. he's extremely powerful and muscular.
his human host took his name as he couldn't remember his own and is granted super strength and a near immortal type of life.
we'll call this Epsilon's beast forme, who he turns into when in situations of high stress.