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Clean House
Defeat Corstilax without any pools of Nightwell Energy expiring in the Arcway on Mythic difficulty.
Clean House is a 10-point achievement earned by defeating Corstilax in the Arcway on Mythic difficulty without letting any pools of Nightwell Energy expire.
Enter the Arcway
Set the Arcway to Mythic difficulty and clear all trash in Corstilax's room before engaging him, so nothing interferes during the fight.
Nuke Corstilax down
Use Heroism/Bloodlust and all major cooldowns immediately when the fight begins — at max level you can burst Corstilax down before pools of Nightwell Energy even have a chance to spawn.
Soak any spawned pools
If pools of Nightwell Energy do appear, every player must step into them immediately to soak them before they expire, as a single expired pool will prevent the achievement.
Tips
If you are struggling to kill Corstilax before pools spawn, use Heroism/Bloodlust after the first set of pools appears instead — see video guide for a visual walkthrough.
This achievement has been completed on Heroic difficulty as well, though the achievement text specifies Mythic.