[X] Given the nature of their magic, and Zaia's greater dependence on his spellbook to prepare his concoctions, ask Esha to part with either her spellbook or Ipsit's, with the understanding that we would, of course, cover the expense of the materials needed to reproduce it. -[X] Leave the decision up to her, whether she prefers the temporary inconvenience of her spells being limited to what she has currently memorized versus the certain loss of spells if we part with Ipsit's book before she finishes deciphering its secrets.