Manastone on a cleric makes their mana regen scale with HP gear (during downtime). There is no other way in the game to increase mana regen with gear.
Manastone on any class with chloro (which is present at every raid, and many/most groups) also increases mana regen.
There is no other way in the game, besides clarity and besides class abilities like lich or canni, to increase mana regen.
Manastone also lets you get off 1-2 extra spells before wiping, that VERY frequently saves a group and sometimes even a raid. That's being completely neglected. Soloing, even as a necro, stoning down my last 30% hp to 10% to cast one last spell to down a bloodthirsty or allizewsaur has finished off a mob when I otherwise would have had to FD and reset.
Rubi bp is only really useful on a shaman end game. It's not that important.
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