What is nihilius?

Darth Nihilus, also known simply as Nihilus, is a Sith Lord and one of the main antagonists in the video game Star Wars: Knights of the Old Republic II - The Sith Lords. He is a feared and mysterious figure capable of draining the life force out of entire planets to fuel his power. Nihilus wears distinctive armor and a mask that obscures his face, making him appear even more ominous and terrifying. His character is shrouded in darkness and secrecy, adding to his enigmatic presence as a Sith Lord.