Kuro Mujou's basic attacks or abilities will add 1 Departing Soul mark to enemy Shikigami and Monsters he hits. When 4 Departing Soul marks have been added to a single Shikigami or Monster, Kuro Mujou enters the Soul Slayer state.

In this state, he gains 25%~40%#c0066cc Armor Penetration (increases at Level 6/11/16), lasting 5 seconds. His abilities also deal an additional 2(#cff3636+8*Current Level #cff3636+4.5%TargetMax HP ) #cff3636 physical damage to enemy Shikigami and 40% damage to Monsters. Basic attacks that deal damage to enemy Shikigami will reduce the initial cooldown of all abilities except [Fickle Doom] by 20%. The basic attack effect triggers once every 3 seconds.