Ulik

 Ulik is a member of the race of Rock Trolls and lives within caverns in the extradimensional realm of Asgard.

Biography
As part of his quest to make himself look like the ultimate hero of Asgard, Loki sent his adoptive brother Thor to Nornheim, land of the Rock Trolls, where Ulik battles with Thor. Contrary to his plans, Loki is forced to aid his brother in activating the Troll equivelant of the Bifrost Bridge, Frostgrinder, in order to escape, realizing the Troll is too powerful for an adversary.