Personal Info:
Real Name: Utgard-Loki
Also Known As: Skrymir
Place Of Birth: Jotunheim, Asgard dimension
First Appearance: Thor Vol.1 #272 (1978) Bronze Age Villain
Known Associates: Frost Giants of Jotunheim
Group Affiliation: Frost Giants of Jotunheim
Base Of Operations: Utgardhall, Utgard, Jotunheim
Grudges: Thor and Balder
Creators: Roy Thomas and John Buscema
Enhanced Abilities: Utgard-Loki has vast super human strength, endurance and durability. His flesh and bone are far denser than similar human tissue, contributing to his superhuman strength and weight, which are also the result of his great size.
Longevity: Utgard-Loki Is extremely long-lived (although not immortal).
Invulnerability: Utgard-Loki is resistant to conventional injury.
Magic: Utgard-Loki is also a master of the arts of sorcery as they have been developed in Jotunheim. The full extent of his magical abilities is unknown, and he needs potions and enchanted dust to perform some of his magical feats. Unaided. he can transform a person into a bird. He also can control the environment of Jotunheim so as to cause a traveller to return to his starting point without knowing it.
Utgard-Loki is monarch of the Giants of Jotunheim. The Giants of Jotunheim, also known as the Etins, are enormous superhuman beings, most of whom dwell in the other dimensional realm of Jotunheim, one of the Nine Worlds of Asgardian cosmology. They are the traditional enemies of the gods of Asgard, with whom they have gone to war numerous times over the millennia. Jotunheim is a flat ring-shaped realm with high mountains along its inner edge. It is apparently on its own separate dimensional plane, distinct from Asgard's or Earth's. However, there are inter-dimensional portals between the mountains of Jotunheim and those of Asgard, permitting easy passage from one realm to the other.
Utgard-Loki at Marvel Database
Utgard-Loki at Comic Vine