Dark God

From DALpedia

"Dark God" is a title given to the ruler of Thanatos. As per tradition to become a Dark God, you must be a demon who has both proven to be the most powerful demon, and have performed many acts of true evil.

Qor was the Dark God of Hell, until he was slain. Abodahon, Iban and many other powerful demons battled with each other to take Qor's place. Iban eventually won the title when all of his competitors were defeated.