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Back En-masse
Defeat Tyr, the Infinite Keeper after closing 18 Time Rifts in Dawn of the Infinite on Mythic difficulty.
Back En-masse requires you to defeat Tyr, the Infinite Keeper after closing 18 Time Rifts in Dawn of the Infinite on Mythic difficulty.
Defeat Iridikron First
Iridikron is the boss before Tyr and must be defeated to reach him. At current War Within item levels he is soloable.
Clear Trash Before Tyr
After landing in Tyr's room, clear the trash on your starting platform, all trash in Tyr's room, and a couple of packs on the far platform to avoid interference during the achievement attempt.
Interact With Temporal Capacitor
On the far platform adjacent to the Tyr fight in Murozond's Rise, interact with the Temporal Capacitor. A zone emote will appear in chat confirming the timeways are unstable, which activates the achievement mechanic.
Pull Tyr, Avoid Damaging Him
Pull Tyr but do not deal significant damage to him. A sandy portal will spawn somewhere on the platform, releasing adds — one main add and several smaller ones. Kill all the adds to close the portal, which will cause another portal to spawn shortly after.
Close All 18 Time Rifts
A counter at the top of your screen tracks how many portals have been closed. After the 18th portal is closed the counter will read 18/18 and no more portals will spawn, so there is no need to track this manually. You can cleave the adds without dealing major damage to Tyr since he stands still during many of his abilities.
Kill Tyr to Complete
Once all 18 Time Rifts are closed, kill Tyr, the Infinite Keeper to complete the achievement.
Tips
Tyr has multiple knockback abilities that can fling you off the platform if you are standing near the edge, so position yourself away from the platform edges during the fight.
If you cannot solo the Iridikron encounter before Tyr, bringing a second player makes both the Iridikron fight and the Tyr portal phase significantly more manageable, with one player handling the adds and the other tanking Tyr.