Malekith

Malekith the AccursedMalekith was the king of the Svart Alfar, or Dark Elves of Norse myth. The Svart Alfar were annhiliated, along with their King, destroyed by the Frost Giants. Loki brought Malekith's spirit back to Earth so that Malekith could recover the Casket of Ancient Winters for him, but Malekith betrayed Loki and attempted to bring the shades of his own people, the Svart Alfar, back to life on Midgard (Earth). Defeated by the Avengers, Malekith's body turned to dust, and his spirit presumably returned to Hel's realm.

Malekith had sorcerous powers, and while he had the Casket of Ancient Winters, could command its ice and cold.