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You can try using the same kind of Bray-Shaman and see if the overcast spells have any miscast chance in their tooltips, if the mod is working correctly, there shouldn't be any mention of miscast chance.
I'll try to have a look at it over the weekend and push an update.
Basically Pheonix's have a "rebirth" spell that automatically casts when they get to 10% hp. it heals them instantly for ~2500 HP with a 50% miscast chance. Basically it's a 50-50 chance to heal back up or die immediately due to a miscast.
Obviously though with no miscast chance Pheonix's cannot die, and makes certain units (like the Caledor herald of the flame dragon, who also has the ability) unkillable too. not a huge deal as i would just have to turn of this mod for every quest battle with pheonix's but still annoying