Damnit Spellcasting AI!

[Bananadine]

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???