Mordius, Titan of Death

During the First Age, Dumera created the First Age Titans as beings of godlike power. Mordius ruled over the domain of death within the Realm of Khilaria. However, toward the end of the Primordial-Titan War, when Batul, the Ruin, escaped from the Unabading Chamber, Mordius' body was possessed by the essence of Batul. With this body, Batul was able to pull against Isana, the Mother, to create the three Realms: Khilaria, Isandur, and Batuldur. Upon creation of these plains, Batul cast Mordius away upon the plane of Khilaria and fought the Mother and her army of recently ascended gods. As Batul cast Mordius away, he corrupted the mind of Mordius, which sent him into a confused rampage. Mordius swept across the continent of Orsandia wrecking entire civilizations in minutes. After the Dawn Gods War, the gods were forced to relocate to the Outer Planes of Celestia, the Nine Hells, or the Abyss. Although they weren't directly within the Realm of Khilaria, this was when they found mortal champions to do their biddings. This lead to the end of Mordius. Though the mortals were unable to directly destroy the body, they were able to separate the heart from the skeleton.