Sounds like a bug with either mana pool, mana Regen or NPC casting mechanics.
Most NPCs should have mana pools under a few thousand, and should Regen at a fairly slow rate.
I tested Lady Vox on Live recently and she had about 3000~ mana and Regenerated about 10 per tick. It also turned out that in her casting priority code after she burned her mana bar on about 10 Retribution casts (this was without me damaging her), she would constantly cast Nullify magic as she ticked up to having enough mana to cast it. It makes sense that in a classic raid of 40+ players you’d see Vox dropped under 50% before she gets time to cast enough Nukes to drain a mana bar, and she would resort to a CH or two. But you shouldn’t be seeing 5 CHs from a single NPC.
It’s very likely that the casting priority logic for NPCs with the cleric spell set is wrong. They should be burning through most of their mana on non-CH things prior to reaching 50% unless you have a ridiculous Zerg of DPS. You should only be seeing them have enough mana to land 1 or 2 CHs in a balanced non-Zerg raid before they exhaust their mana and resort to casting lower mana spells as their Regen ticks up.
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