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Mosh Pit
Get a combination of 8 players and Scarlet Defenders caught up in Armsmaster Harlan's Blades of Light simultaneously and then defeat Armsmaster Harlan in Scarlet Halls on Heroic Difficulty.
Mosh Pit requires getting a combination of 8 players and Scarlet Defenders caught in Armsmaster Harlan's Blades of Light simultaneously, then defeating Armsmaster Harlan in Scarlet Halls on Heroic difficulty.
Enter Scarlet Halls Heroic
Enter Scarlet Halls on Heroic difficulty and pull all available adds before engaging Armsmaster Harlan, then use Heroism, Bloodlust, or Time Warp and burst him down to at least 30% health.
Collect Adds During Fight
As the tank, pick up the two adds that spawn during the first phase, then pick up the two additional adds that spawn during the next phase, giving you four total adds in the room.
Position Before Blades of Light
When Armsmaster Harlan is about to cast Blades of Light, move back toward the room entrance; the healer should jump into the pit while the rest of the group positions near the flag next to the wall on the opposite ramp to ensure all adds and players are caught by Blades of Light simultaneously.
Survive and Finish the Boss
Pop survival cooldowns while caught in Blades of Light, allowing the healer to keep the group alive, then burn Armsmaster Harlan down before another Blades of Light cast occurs — note that only Scarlet Defenders who die to Blades of Light appear to count toward the 8-target requirement, and having more than 8 caught is acceptable.
Tips
The RaidAchievement addon can confirm when the 8-target requirement has been met so you know when it is safe to finish the boss.
See the video guide for a visual walkthrough of the positioning strategy.