DND series : Nerull (Diety)

Nerull, also known as the Reaper, the Foe of All Good, and the Hater of Life, is the god of death, darkness, murder, and the underworld in Dungeons & Dragons. He is a greater deity and is usually depicted as a dark-robed skeleton with rust-red bones and scraggly green hair. Nerull wields a staff called Lifecutter, which can grow a scythe blade made of scarlet energy.

Nerull's clerics, feared throughout the lands, are often solitary and secretive, wearing rust-red robes and ivory skull masks. They engage in ghastly rituals performed in absolute darkness, and their services are filled with litanies of fear and suffering. Temples dedicated to Nerull are hidden and usually subterranean, except in the most evil lands​