Dimensius l'Omni-dévoreur

Dimensius calls down meteorites on the platform that land one after the other. They kill anyone on impact.

The impact also launches a shockwave across the room that deals heavy damage to players hit and take 300% more damage for 3 s from other shockwaves.

Run around the platform to cross early one shockwave and lose the vulnerability before crossing the next.

Shortly after the raid lands on the platform for P3, Xal'atath stuns Dimensius for 15 s.

He also takes 100% more damage for the whole duration. Bloodlust and nuke him.

Dimensius is immobil and stands in the center of the platform during this phase.

When he's no longer stunned, Dimensius starts a 10 s channel that calls down 8 stars on the platform.

Stars kill anyone they hit on landing, and deal heavy damage to the raid.

Then the stars start orbiting around boss on the edges of the platform. 

The stars are essential to survive when the boss tries to Devour the raid.

At the end of the flying section, there are 2 platforms. There is 1 mini-boss on each. 

Divide the raid in 2, each half lands on their designated platform and kill the mini-boss there.

Players who collected Stellar Cores deal heavy damage to the mini-boss of their platform upon landing.

Shortly after landing, Dimensius starts a 32 s channel. If both mini-bosses aren't dead before it completes, the raid dies.

Dimensius throws an asteroid on the add's platforms that kills anyone hit.

Quickly choose and kill a Voidwarden from a wall to get to a safe section and dodge.

Unique ability of Pargoth, the mini-boss of the right platform:

Casts an explosion arounds it that deals damage to anyone hit.

Black holes in space.

Instant Spaghettification on contact. Satisfaction guaranteed or get your money back!

Giant moving laser beam that tears through the entire dimension.

If you get too close to it, you die.

At the start of the phase, Xal'atath buffs the raid with Soaring Reshii, allowing you to get on your flying mount.

Refresh this buff during the phase by going through the gates Xal'atath spawns on the way.

If you lose the buff, you die instantly.

Massive Physical and Magic attack on the tank that also hits anyone 20 yds around. Leaves a 100% Physical damage taken vulnerability for 50 s on the tank. Swap tank after each.

This attack also launches a shockwave that deals damage and knockbacks all other players.

It also summons adds.

At 100 Energy, Dimensius channels for 5 s, dealing heavy raid damage. When it finishes, he devours the raid.

Players with Excess Mass must stack together to create a circle of Collective Gravity. Each player with Excess Mass adds 1 stack to the circle.

Players inside a circle with more stacks than Dimensius’s Growing Hunger stacks survive.

Devour absorbs all Living Mass adds and Excess Mass, and grants Dimensius 1 stack of Growing Hunger each time.

Dimensius slams the platform with both hands, killing anyone below.

2 giant spheres spawn where the hands smashed the platform that explode after 10 s, killing the raid.

Divide the raid in 2, each half stands next to a sphere to drain it, reducing their size and the strength of the explosion.

The spheres also shoot projectiles that deal heavy damage and stun anyone hit.