It's documented, and it happened today after server restarts.
https://worldofwarcraft.com/en-us/ne...s-september-16(Hotfix in testing; to be applied with next weekly maintenance) Most abilities used by Tank specializations have had their damage reduced by 10%. Abilities which are shared with other specializations remain unchanged for those other specializations.
Glad to hear most don't seem to be noticing it.
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