Kagemaro is the dreaded kami of the first human to be so evil that his spirit became an oni. It has spent one thousand generations of perfecting the art of suffering.
Kagemaro, a feared and fearsome ancestor kami, an ultra-powerful, ancient master of death magic with supernatural aspects. It has a multitude of weapon-wielding limbs, a swollen body, and a breath of black vapor. The energy objects floating around him are disturbingly muscular or organlike, and he squats on some kind of fungal throne in the swamp.
The mist was thick, cloying, and constricting. Shiro fought his way to fresh air only to look back and see his comrades fallen on the battlefield behind him. (Kagemaro's Clutch)