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The Twilight Destroyer (10 player)
Defeat Halion in The Ruby Sanctum in 10-player mode.
The Twilight Destroyer (10 player) is a 10-point achievement earned by defeating Halion in The Ruby Sanctum on 10-player mode.
Clear the three bosses
Enter The Ruby Sanctum and defeat the two bosses on the sides of the raid before engaging the boss in the back. All three must be defeated before Halion flies down to fight.
Handle trash carefully
Interrupt Invokers immediately or they will AoE knockback the entire raid. Split Commander groups as thin as possible — in 10-player mode the groups have 4 mobs, so split them into 2 groups of 2 — since Commanders apply a buff that increases damage done by 25% per friendly target within 8 yards.
Tank swap on Warborn
The Warborn boss (left side) applies a debuff that requires tanks to swap. At around 30% health he splits into two, so be ready for the add.
Use second tank outside in phase 2
Have the second tank remain outside during phase 2 so they can pick up Halion before other players exit the portal, reducing the burden on healers and allowing that tank to use cooldowns immediately at the start of phase 3.
Use Bloodlust in phase 2
Use Bloodlust or Heroism during phase 2 to significantly ease the damage check on Halion.