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Lose Your Illusion (25 player)
Defeat Thorim while Sif is present in 25-player mode.
Lose Your Illusion (25 player) is a hard mode achievement earned by defeating Thorim while Sif is still present, which requires reaching and engaging Thorim in under 3 minutes after the encounter begins.
Clear the Arena Adds
Enter the encounter and kill the adds in the arena room, then pull the lever on the side of the arena to open the gate to the tunnel.
Run the Tunnel Fast
Rush through the tunnel while Thorim is talking — you must reach and engage Thorim in under 3 minutes from the start of the encounter, because engaging him before the 3-minute mark forces the hard mode fight where Sif remains present alongside Thorim.
Engage and Kill Thorim
Attack Thorim and he will jump down into the arena — follow him and kill him there. Do not run back through the tunnel at any point, as this will reset the fight and lock you inside the hallway.
Survive Sif's Abilities
Sif cannot be killed and will attack with Frostbolt Volley, Frost Nova, and Blizzard throughout the fight; she also removes the Touch of Dominion debuff from Thorim, increasing his damage by 67% and his health by 43%, so kill Thorim before the 5-minute mark or the raid is wiped.
Tips
See the video guide for a full walkthrough of the tunnel run and hard mode execution.
Even if you wipe during the hard mode attempt, you will still earn the Heroic: Siffed achievement for having engaged Thorim with Sif present.