Krannus was an uncommon male Pureblood Sith without Force-sensitivity. He held the position of military commander within the Sith Empire during the [Galactic War]. His Sith parents nearly allowed Krannus to die, but the Sith Emperor intervened directly, saving him. Despite being seen as lesser compared to Sith who could use the Force, his lineage elevated him above typical Humans in the Imperial Military.
Holding the high-ranking position of Executor, Krannus served the Emperor, who saved him, with intense loyalty, using his great power. Krannus, following his master's commands, headed a death-worshipping cult whose followers thought the Emperor was a god who would grant them immortality and boundless power, but only if they first caused the galaxy's annihilation.
Krannus traveled to Belsavis intending to obliterate the entire planet to initiate the Emperor's ritual to accomplish this objective. However, the [Hero of Tython] stopped and killed him.