From Guild Wars 2 Wiki
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Pillar Pandemonium is an effect gained by creatures in The Key of Ahdashim raid. Players can only remove the stacks by causing two of the enemy's Boulder Barrage attack to hit a Damaged Pillar.“
Damaged pillars are empowering this creature. Outgoing damage is increased by 20% per stack. Incoming damage is reduced by 20% per stack.
— In-game description