The bard epic mods the level 32 song to 12 or 13 mana per pulse. A song takes 3 seconds to play, meaning you get a full rotation in two ticks. Cantata is 1 of 4 songs, Cassindra's Chorus of Clarity is 3 of 4. That means in two ticks you get anywhere from 88 to 91 mana, making it 44-45.5 mana per tick.
This stacks with every other form of mana regen in the game minus a second Cantata (though one bard can do this, and the second can just play Cassindra's non stop which would stack). It is also noteworthy to mention the 21+ extra hp regen which stacks with all other forms of hp regen which complements the extra mana regen of shamans and necros.
So basically, C2 x 4.
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