Darth Bane and Darth Revan both hide their faces, but still act as living people. But Darth Nihilus presents himself as an inhuman being. He flies crew-less scraps of abandoned flotillas ...
Darth Nihilus was known as the Lord of Hunger because he had the ability to consume planets. Darth Revan is a fan-favorite Sith Lord in Star Wars, and while he hasn't been shown on screen yet ...