Gruul the Dragonkiller can be found in Gruul's Lair, a 25-man raid dungeon in northern Blade's Edge Mountains. He is the second and final boss, after High King Maulgar. There is no attunement required to reach him, and he is one-half of the Serpentshrine Caverns attunement quest, obtained in Heroic Slave Pens.
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NeXXuS vs Gruul the Dragonkiller - 9.38 mins
Dark Crusaders vs. Gruul The Dragonkiller - 10.29 mins
Niflheim vs. Gruul the Dragonkiller - 7.18 mins
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