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Dehydration
Defeat Ichoron in the Violet Hold on Heroic Difficulty without allowing any Ichor Globules to merge.
Dehydration requires you to defeat Ichoron in the Violet Hold on Heroic Difficulty without letting any Ichor Globules merge, accomplished by activating one of the lightning crystals mounted on the walls before the globules can combine.
Locate the Wall Crystals
There are 5 lightning crystals total in the Violet Hold — the one at the entrance cannot be used. The first 3 are on the lower floor: one on the left, one on the right, and one to the left of Ichoron's cell. The remaining 2 are on the upper floor: one left of the Voidwalker boss cell and one to the left of Moragg's cell. They appear as small red crystals on golden holders spread across the walls.
Activate a Crystal During Ichoron
When Ichoron is about to split and release Ichor Globules, immediately click one of the usable wall crystals. This fills the room with lightning and kills all the globules before they can merge, completing the achievement.