Deep within Manaforge Omega, Dimensius—the All-Devouring and destroyer of K’aresh—is slowly waking as his devoted ethereal followers use the Dark Heart to give him sustenance. If they succeed, they will unleash a being of unfathomable power that could destroy the very fabric of reality. 

This boss fight consists of 3 phases with an intermission between the first and second phases. At any point during the fight, any player who enters Dimensius' body suffers from Oblivion which instantly kills the player. In the intermission, players will use their Reshii Wraps to protect against Endless Darkness and to be able to use flying mounts.

The final two phases of the fight involve planet-level threats and even an attempt to seal the worldsoul fragment. It's a final push against a world-ending threat. 

See Wowhead for more information: https://www.wowhead.com/guide/the-war-within/raids/manaforge-omega/dimensius-boss-strategy-abilities

Tactics

Split Raid in Two
Mark Tanks
Assign 4 gravity soakers each side

Phase 1

• Split raids left/right enter portals at the same time and nuke Living Mass add.

• On death it drops an Excess Mass debuff.  Someone pick it up (walk over).

• Devour (1) - all stack in centre to soak.

• After soak, split to sides again, active tank remaining in middle.

• Stay nearer front edge.

• Smash (large hollow circle) on tank causes knockback. be outside circle, be aware of knockback.

• Tank swap after each Smash.

• Sides: Spread for small rings, kill adds, pick up more Excess Mass.

• Sides: Antimatter spheres - stack in the edge of them AFTER smaller puddles/ball appears, to soak.

• Medium blue circle with marker over head - move to back edge to get launched.

  • Excess Mass person needs to stand under each one to pull them back down.

• Devour - stack on your own side.

Phase 2

• Brief cut scene, then mount using Dragonflying mount and fly forward through rings, avoiding beams/wall.

• Kill add.

• Not long after landing, X of adds appear, creating walls.  Kill at least one add in each wall.

• Extinction - large frontal.  Will happen on platform in front of his raised hand - be on the other side at edge (bit that sticks out).

• After frontal, get to the edge closest to boss for pushback.

• Repeat for second platform.

Phase 3

• Boss takes extra damage briefly - BLOODLUST.

• 8 big balls arrive, rotating around.  Avoid (mostly!).

• Rings appear .. give a (3s?) debuff when you cross the line - have it fall off before crossing the next ring (so first ring asap)

• 100 energy - Devour.  Hide under a ball - move with it.

• Some balls will turn into black holes.  Avoid!