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Heroic: The Twilight Destroyer (25 player)
Defeat Halion in The Ruby Sanctum in 25-player Heroic mode.
Heroic: The Twilight Destroyer (25 player) is earned by defeating Halion in The Ruby Sanctum on 25-player Heroic difficulty.
Enter The Ruby Sanctum
Enter The Ruby Sanctum raid instance on 25-player Heroic difficulty. You can go directly for Heroic mode without needing a Normal mode kill first.
Kill Guardians and Trash
Defeat all three guardians and the trash mobs inside The Ruby Sanctum before engaging Halion.
Engage Halion, Enter Portal
Attack Halion until the Twilight Portal spawns, then enter it. Once in the Twilight Realm, attack Halion again until a second Twilight Portal spawns, then enter that portal to return to the physical realm.
Defeat Halion
After exiting the Twilight Realm through the second portal, burn Halion down to complete the fight and earn the achievement. Do not rush through the portal phases too quickly or the achievement may not trigger correctly.
Tips
See the video guide for a full walkthrough of the Halion encounter in The Ruby Sanctum.