E.I.N.

E.I.N. is a creature in the Soul series of fighting games. His first appearance was in the series' sixth installment, Soulcalibur V. He is a werewolf-like spirit that Z.W.E.I. can summon during battle. He is referred to as a minion in Z.W.E.I.'s profile, thus confirming E.I.N. is a being inferior to him.