King of Crimson

He was known as the Crimson King or the Red Cyclops. A giant in both physical and psychic terms, the copper-skinned Primarch possessed tremendous innate psychic ability, and constantly studied and attempted to understand the Disformity, becoming a sorcerer of formidable power. Magnus believed he would be able to control the Great Ocean of psychic energy that was the Disformity, though his prodigious and careless application of his psychic gifts eventually brought him into disgrace with his father, the Emperor, as well as most of his brother Primarchs. His psychic immaturity, recklessness and arrogance also caused his undoing, for they ultimately brought about his damnation and service to the God of Change.