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Call of the Grand Crusade (25 player)
Defeat every boss in the Trial of the Grand Crusader in 25-player Heroic mode.
Call of the Grand Crusade (25 player) is a 10-point achievement earned by defeating every boss in the Trial of the Grand Crusader on 25-player Heroic difficulty.
Set Difficulty to Heroic
Before entering the raid, set the difficulty to Heroic, then verify the difficulty is still set to Heroic once you are inside the instance, as it can revert to Normal upon entry.
Defeat All Bosses
Enter the Trial of the Grand Crusader and defeat every boss, including Lord Jaraxxus and Anub'arak, on Heroic difficulty. Note that during the Lord Jaraxxus encounter, Mistresses of Pain can still cast Pain Spike, so be prepared for that ability.
Manage Anub'arak's Final Phase
In Anub'arak's final phase, he leeches a significant amount of health, making it critical to push him below 10% before the raid is overwhelmed. His stacking debuff will escalate in damage over time, so sustained DPS output is essential in this phase.
Tips
If attempting The Traitor King achievement simultaneously during the Anub'arak fight, be aware that allowing 25 adds to stack on you will apply a debuff that grows increasingly lethal even at high item levels, so consider completing each achievement in separate lockouts.