Odin sacrificed his right eye to Mimir for the wisdom to prevent Ragnarök. Mimir was a virtually omniscient being with precognitive abilities. Thor often traveled to Hildstalf, to seek out the wisdom from the Well of Mimir. Thor sacrificed both his eyes for insight on how to permanently stop Ragnarok. Mimir was shown to have been killed in the destruction of Asgard by the Thunder God himself.