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Onyxia's Lair (25 player)
Defeat Onyxia in 25-player mode.
Defeat Onyxia in 25-player mode to earn this achievement.
Defeat Onyxia
Enter Onyxia's Lair and defeat Onyxia. Prepare for a boss with approximately 22 million health. Expect elite adds before the boss encounter with roughly 18 million health each and capable of dealing up to 15, 000 damage to plate-armored players. During the fight, Onyxia summons whelps with around 180, 000 health each that pose a significant threat to the raid.