Mangog

 Mangog is the sum total of the hatred of a billion billion beings that were once killed by the ruler of Asgard and the Norse Gods, Odin.

Biography
Loki tricks Thor into releasing Mangog from his imprisonment as part of a plan to discredit his brother, but he is forced to help Thor return to Asgard when his own plan to destroy Mangog fails. Having defeated Mangog's invading allies to deprive him of the hatred that empowers him, Thor fights with Mangog while Odin strikes Mangog with spears to damage his armor. As the fight concludes, Odin allows the souls that empowered Mangog to pass on to their reward and peace in the afterlife.