You can find the Utgarde Pinnacle dungeon within Howling Fjord.
The coordinates are (56.0,45.4)
1. Svala Sorrowgrave
Heroic Differences: Ritual Channelers cast Shadow in the Dark deals ticking shadow damage.
2. Gortok Palehoof
/i Defeat the 2 trophies that come alive, then boss. Avoid frontal cone Arcing Smash. Withering Roar deals damage & lowers max health, this stacks. Throws a spear at player, deals ticking damage.
Heroic Differences: You will fight all 4 Trophies before boss.
3. Skadi the Ruthless
/i Boss flys in air, avoid freezing clouds that land on floor. Pick up Harpoon & fire them in the Harpoon Launcher when boss in range. The Harpooner mob drops them. When boss down avoid his moving Whirlwind. Throws a Poisoned Spear at a player.
4. King Ymiron
/i Will call upon a Fallen King 2 times to grant him a new ability, he stuns all players when chooses. Deals shadow damage to players & lots of ticking damage. Keep players healed up for Dark Slash.
Heroic Differences: Will call upon a Fallen King 4 times to grant him a new ability, he stuns all players when chooses.