Lapidating Bash
Tank: Keep the boss aligned with the edge. His heavy attack, Lapidating Bash, creates a T-shaped effect toward the sides and front, leaving the middle clear.
Lava Phase: Flame Wall
All: During the Lava Phase, at 80%, 50% and 35%, avoid, dodge or block the Soulbinder Pyromancer add's Flame Walls.
Lava Phase: Soulbinder Pyromancer priority
Dps: Prioritise killing the Soulbinder Pyromancer. Stack the other adds onto it so they die together to cleave, and the boss returns once it is dead.
Black Gem Shard stack-up
All: Stack up when the small Black Gem Shard effects appear, then block or move out together. This keeps the spawned Atronach adds close together.
Soul Focus beam
Healer: Stand as the furthest player so Soul Focus targets you, and keep the Atronach adds, and ideally the tank, inside the beam. Its damage is shared among everyone standing in it.
Black Gem Barrage
All: If marked with Black Gem Barrage, keep moving. Do not touch the effects it drops; they explode for heavy damage.
Execute: Transference
All: In the execute at 35%, dodge or block Transference's reappearing effect, or be knocked back. Lava and heat now cover either the edges or the centre.