I'll test it to those parameters a bit, but at the moment I'm fairly sure that the 10% thing doesn't matter. Nor the level 20 issue. But rather, if the damage were to kill the mob, it is instead 100% resisted.
I just know for sure that Rain of Swords can NOT kill a mob at the moment, period.
a sand scarab in EC, 100% resist, all waves.
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kobolds in solb around 70% hp, first wave hits, all subsequent waves 100% resisted or don't show message at all
also: by your last post nilbog, are you inferring that this is a purposeful change? that aoe spells aren't meant to be able to finish off mobs?