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Heroic: De Other Side
Defeat Mueh'zala in De Other Side on Heroic difficulty or higher.
Heroic: De Other Side is an achievement earned by defeating Mueh'zala in De Other Side on Heroic difficulty or higher.
Enter De Other Side dungeon
Travel to De Other Side and enter the dungeon on Heroic difficulty or higher.
Defeat Mueh'zala
Progress through the dungeon and defeat Mueh'zala, the final boss, to earn the achievement.