If you have a flare up aura that adds 100 max damage but are casting a spell that only does 1 to 10 damage you'll only do 1 to 20 damage, not 1 to 110 damage.
Make sure the spells you are using do at least as much damage as the flare up aura.
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Computing the probability that at least one of the following events will occur:
P(a or b ... or z) = 1 - P(!a and !b ... and !z)
Probability
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