25% Damage Done, Healing And Speed Buff (Patreon)
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This buff affected my character in Korrak's Revenge (epic pvp battle). There are multiple reports of players carrying it everywhere.
In Dragonflight there were reports of this bug being taken out of the Dragon Isles - it is buff awarded by the dreamsurge events that take place constantly in Dragonflight. See my original article here https://www.patreon.com/posts/dreamsurge-buff-89964815
I am testing to see if this is still the case or possibly it has been rolled back-but this buff seems to be commonplace in-game right now so it may not matter, since it seems you can obtain it simply by being in a raid group with someone who has it. It may be easier to find it simply by queing for raid content rather than obtaining it in the original manner.
Thanks to Xan66 for alerting me to this.