Auntie Mehitabel's Natural Causes is a poison with which Zola hit Agatha. Tarvek noticed the stab and reported it to Violetta, who was able to identify it. Gil hadn't previously heard of it, but according to them , it is a slow, subtle poison, really hard to detect, which usually means deadly, unless you know it's there and have the antidote. Which Smoke Knights do, of course.

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