Kulan Gath, the most powerfu sorcerer that Doctor Strange has fought, turns out to be a cannibal. He eats the organs of his vanquished opponents, or drink their blood, to gain their powers and spells. Doctor Strange used the eye of Agamotto to learn about Kulan Gath’s rise to power. In his journey, he discovered that Kulan once killed a Sorcerer Supreme by the name of Mekri Ra, and cannibalized him.
From – Savage Avengers #11