There is a Warlock talent that improves health stones. It had two ranks. This allowed situations where players can have one of each rank health stone.
This rarely happened, but Vanilla treated each rank as unique. I can only remember once that it occurred, during a run with two locks. I was one the warlocks.
Does anyone know if this will be in Classic?
Should be, although IIRC, they shared a cooldown. Our raid made use of it for certain members of the raid.
The other “fun” one that Mages stockpiled were Mana Gems, although those couldn’t be traded.
Thanks for the reply. I thought that I might have misremembered this detail.
Of course, they may have nerfed it by 1.12, too lazy to check patch notes.
It certainly was “a thing” during Vanilla though.
Edit: For warlocks it may have been nerfed when they became able to summon the health-stone dispenser thingy.