debuff-stacking
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Replenishment is mandatory and other buff discussion from Ghostcrawler
One of the major overhauls heading from Burning Crusade into Wrath of the Lich King was the consolidation of buffs and debuffs. In an attempt to keep raid groups from thinking they had to bring one specific class to get one specific buff or debuff, Blizzard switched some spells up, gave buffs to more classes, and made them unstackable, the result being that one can take one of a certain handful of class and specs to get the buff or debuff they desire, in theory giving a raid more choice about who they bring. Still, the buffs and debuffs remain, and Ghostcrawler has been having some pretty interesting discussions about them in the past few days. To start with, he came out and said it pretty plainly: Replenishment is Mandatory. Blizzard will balance fights under the assumption you have Replenishment much as they do under the assumption you have a tank. In the short term, this means your raid is probably going to want to find a Shadow Priest, Retribution Paladin, or Survival Hunter if they haven't already.
