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Lose Your Illusion
Defeat Thorim in Ulduar while Sif is present.
Lose Your Illusion is a timed achievement in Ulduar that requires defeating Thorim while Sif is present within 3 minutes of entering the instance.
Enter and open the gate
Run into Ulduar and locate the gate on your left. Pull the lever beside it to open the gate.
Kill the initial adds
Defeat the adds in the middle area to trigger the encounter with Thorim.
Rush upstairs to Thorim
Run all the way upstairs and defeat Thorim before 3 minutes have elapsed from when you first entered the instance.