They nerfed it and announced it
https://us.forums.blizzard.com/en/wow/t/corruption-effect-hotfix-incoming/413653
and then they “adjusted” it
With a hotfix that is now live on all realms, we’ve adjusted the damage done by several Corruption Effects:
Damage dealt by Infinite Stars, Twisted Appendages, and Gushing Wound is now based on the item level of the Corrupted item. This previously scaled dynamically with Attack Power and Spell Power.
Lash of the Void damage is now based on the item level of the Corrupted Item, and now procs less often than before.
Previously the damage dealt by these powers was modified by Attack Power and Sp…
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