It's My Turn

"It's My Turn" is a triumph that is completed by defeating the Forgemaster, Ir Gohl, in the final part of the Oblation Exotic mission, Oblation: Immolation, and looting the reward chest that appears after the fight. The chest holds the final Cull's Shadow catalyst.

Finish Oblation: Bloodline and Oblation: Soulfed. At the end of Soulfed, equip Cull's Shadow to unlock the terminal for Oblation: Immolation.
Get through the sarcophagus crossing, the bellows encounter and the platforming gauntlet that come before the boss.
Phase 1: Go to each of the three corners with a soulfire pyre and kill the Forgebound Cantor Wizard there. Then damage Ir Gohl until he retreats to the forge.
Phase 2: When he becomes immune, stay out of the middle of the arena. His hammer slam leaves soulfire that can kill you instantly. Instead, go to whichever pyre is lit, pick up soulfire worms and throw them at the green crystals on the island platforms.
Once the crystals are activated, damage Ir Gohl again. If he becomes immune, wait at the pyres for more worms to spawn, then finish him off.
Enter the middle of the forge and interact with the Dredgen Lightbearer to spawn the reward chest. Loot it to complete the triumph.

Stay near the pyres during the immune phases. New worms spawn there, so you do not have to fight in the central area.
Each boss phase is the hardest part of the mission. Keep moving between crystals and cover instead of standing in the open.

Requirements