Three phase fight - an add phase and two boss phases.
Kill regular adds to activate big adds.
Dodge stuff on floor and stay a bit spread out.
Use the shield from big adds (yellow circle around them) during Exposed Core (when boss gets to 100 energy).
Use the bombs from the big adds and throw against wall where the boss is stuck (extra action button - make sure it throws!).
Face boss away from the raid (frontal) and taunt swap at 50 energy (pneumatic impact).
If you get Matter Dissolution debuff, run far away - orbs appear in a circle around the player, slowly moving towards where the player was when they appeared (player runs back to group, through gaps between orbs).
Phase 3 (15%):
Soft enrage. Raid wide damage. Bloodlust, Healing CDs.
Make his health hit zero before yours does.