It's regen, it's classic and intentional ( except for the mana debuff )
Rage is something like 28regen at 50, those stats are 60 if no one noticed, throw on a chloro and sit down your at 40 regen without rubi or troll which basically cancels canni. I see too many shaman sitting down on the job!
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A few months ago the rejuvenation potions stacked as well, I would sit at 83 regen with rubi, but they had removed it.