Donut's utility spell that carves a temporary hole through matter — a lockpick, door-breacher, and (in older use) a lethal blade.
Hole is Princess Donut's utility spell, made far stronger by her Glass Cannon class (an effective eight-inch depth on this floor). During the City Hall heist she uses it to bore through a security door to reach the bolt, then to excise deadbolts and door-jamb outright to swing a locked door open — learning that snapping the spell off can violently misalign whatever it removed. Carl recalls its lethal edge from when they once used it to cut a man's head off.
Donut's versatile matter-removal spell for breaching, lockpicking, and killing.
Also appears in books you've already read — spoiler-safe to their endings: