Kimaris

Kimaris is a demon and Marquis of Shadowfell.

His weapon is a bow capable of firing condensed shadowy matter that engulfs the target in an endless void of darkness, causing them to be blind and in a state of sheer panic. The victim will eventually go mad and take their own lives.

Physical appearance
Kimaris initially appears as a Godly warrior riding a black horse.

Etymology
Kimaris' name is believed to derive from the Cimmerians, a warlike people mentioned in the works of several classical authors as dwelling totally in darkness.