Darth Demonicus

Darth Demonicus was possibly the most powerful Sith ever. He could destroy entire planets with the Force and could eliminate entire races, remake them in a different way or even completely alter their DNA buil-up. He was first the apprentice of Darth Murdrus then was taken as an apprentice by Darth Scyreus who believed that the two most powerful beings in the Galaxy should rule together. Darth Genocidus revealed himself to Scyreus but was not killed. Instead Darth Scyreus, Darth Genocidus and Darth Demonicus would control the New Sith Triumvirate.

Behind the Scenes
Demonicus's root word is "demonic".