The Old Monk is nothing more than a black phantom summoned by the original Old Monk, and is being controlled by the golden robes. If the player is not invaded, or is playing offline, the Old Monk's weapons are a pair of claws. He will be wearing the Gloom Set and the Yellow Head Collar, and at times will take out an Insanity Catalyst and cast Homing Soul Arrow (up to 5 orbs). However, what makes this boss unique is that if you invade someone in or are invaded in 3-3, the invader will become the Old Monk instead. If you are the Old Monk and you win, you will gain a body as well as the Yellow Head Collar.