Kurobozu

Kurobozus, also known as black monks, are the vengeful undead remains of members of highly structured groups, such as ascetics, priesthoods, and solarian orders. They have empty, black eye sockets and often seem to be little more than leathery husks of skin, despite their significant physical power.
Some kurobozus arise when they violate the tenets of their orders in ways that create great suffering. Others are the result of living creatures following a rigid path designed specifically to lead to this undead state. Their entire lives are spent preparing themselves for a vile ceremony in which they are ritualistically choked to death.