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Prince Keleseth is the first boss your group will come to inside the Utgarde Keep dungeon in the Howling Fjord. As far as dungeon bosses go, he is not particularly difficult, but it will benefit you to know what some of his abilities are before attempting to kill him.
Normal Mode (Levels 70-72)
Shadow Bolt: Deals 2975 to 4025 Shadow damage.
Frost Tomb: Encases a player in a block of ice for 20 seconds and causes 400 damage per second. Other players can destroy the Frost Tomb to free the encased player. This spell is resistible. It used to be that PvP trinkets and select class abilities could remove the Frost Tomb, but some of these have been changed.
Raises Five Vrykul Skeletons: Throughout the fight Keleseth will raise five skeletons to fight against you. You can kill them, but he will resurrect them again shortly. The skeletons cast Decrepify on their target. The skeletons can be crowd controlled.
Decrepify: Decrepifies the target, reducing Strength by 100 and slowing movement by 30%.
Heroic Mode Differences (Level 80)
Shadow Bolt: Deals 5950 to 8050 Shadow damage.