Darth Nihilus is a Sith Lord and leader of the sith order. He was the master of Sen Urec before Sen left the Sith.
As his former apprentice describes him: "He wants the universe. He hungers for more power and more again. To him, everything exists to be consumed by his hunger."
Nihilus is an immensely powerful force user and legendary in the art of swordplay. Like his apprentice, he wields force rage, as well as his counterpart, Darth Sion.