Terminus Roiler will tether the healer to repeatedly apply Healing Magic Down.
Boss #1: The First Beast
Venomous Breath: Short-range cone AoE on tank.
Meteor Rain: Non-tanks are marked, dropping meteors that explode for medium proximity damage after a delay. Drop these near corners, but not directly against the wall.
Falling Sky: Two players drop large circular AoEs.
The Final Sky: Line-of-sight the boss behind a meteor—lethal if failed. After this resolves, move opposite the boss to avoid a massive AoE.
Trash: Second Doom
Boss #2: Terminus Bellwether
Shrill Shriek: Raidwide.
Burst: DPS check. Explodes for raidwide damage when killed.
Trash: Third Doom
Aimed lasers throughout. Ranged and casters should stay away from melees to minimize chaos.
Boss #3: Therion
Shadow Wreck: Moderate raidwide.
Apokalypsis: Move to any side platform that isn't pink and cracked. Sustained damage in a wide column.
Therion Charge: Proximity AoE. Relatively low damage; move back to the next set of side platforms.
Deathly Ray: Alternates.