Defensive spell the party urgently wants a spellbook for, but cannot find in town.
With only 100K gold left after buying the two new rooms, the party's priority purchase is a Shield spellbook for Princess Donut. Mordecai takes her around the town's local shops to look for one, since there is no Desperado Club on this floor and it isn't yet safe for Carl to try entering Club Vanquisher.
The trip is mostly a bust — no Shield spellbook and no Golden Throat gear — and there is nothing good on the Shop Interface either, though Mordecai expects that to change over the next few days.
Missing defensive spell the party wants before the hunters are released.
Also appears in books you've already read — spoiler-safe to their endings: