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Spoilers for Books 1–8
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All eight books included

Future-floor spell · Introduced in Book 8
Tome of Gatekeeper
The Tome of Gatekeeper teaches a spell that temporarily blocks class-associated abilities. Donut gets an advance copy she can install, but she cannot cast it before Floor Twelve.[1]
Choose Book 8 or later above to read this section.
Spell rules
It costs seventy-five mana and can target opponents, NPC deities and an unexplained category called OI entities. Against a deity, it blocks abilities tied to worshippers rather than physical traits such as a lava body.
Its duration in minutes is calculated by adding five to the spell level, then multiplying by the caster’s Intelligence divided by the target’s combined Constitution and Charisma. Higher Intelligence helps the caster; the target’s Constitution and Charisma shorten the effect.[1]
Choose Book 8 or later above to read this section.
History
Book 8
A Parade of Horribles
Donut receives the tome before she is allowed to use it. The description gives the rules, but the spell is not demonstrated at that point.[1]
Choose Book 8 or later above to read this section.
Sources
References are to Matt Dinniman’s novels. Book links open our recap guides.
- A Parade of Horribles, Chapter 89.