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				 Re: Damnit Spellcasting AI! 
 BUT WAIT
 I just tried having my wyvern cast Invulnerability.  I don't think Invulnerability prevents ironskin from being applied later--but it DOES seem to change the AI's opinion about whether ironskin SHOULD be applied.  The wyvern fell into a steady state of summoning phantasmal warriors for many rounds, and did not ever use Ironskin.  Victory???
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