Mordru the Merciless is a Lord of Chaos.
Featured in these Comics
History
Mordru is an immortal sorcerer who is usually an enemy to the Legion of Super-Heroes in the 30th Century. It was later revealed that he was a member of the Lords of Chaos with origins on Gemworld. His home is the planet known as Sorcerers' World, the universal center of all magic. He frequently attempts to manipulate the Legionnaire known as White Witch, and has also been married to her. Mordru was created by Jim Shooter and Curt Swan, first appearing in Adventure Comics #369