Donut's mass-conversion spell that would freeze her in place for five minutes if cast.
Seeing Zarogoths appear everywhere across Larracos, Princess Donut announces she wants to try Minion Army on them once she has dealt with the Rolling Battle Formation Ball.
Carl notes what she is glossing over: the spell would freeze Donut in place for five minutes. With Harpocrates closing on her tower and only minutes away, his answer is immediate and absolute — "Absolutely not."
Powerful spell rejected outright because its five-minute lockout would get Donut killed.
Also appears in books you've already read — spoiler-safe to their endings: