Editing Macchiato Monsters: The Stygian Library (section)

====How Spell Scrolls and Spellbooks Work====
Anyone who either knows Parametric or has spellcasting (including both Dee and Mr. Patch, as well as Kas and Man, and potentially Yulia but she'd roll her Δ6 to cast) can cast a spell from the scroll. You roll your spellcasting attribute (INT with disadvantage for Mr. Patch) but do not pay any reagent or HP cost. Once cast successfully, the scroll disintegrates.

You can also use either a spell scroll or a spellbook to learn a spell permanently. This takes 1d4 days and requires paying in Electrum for reagents and study materials. You must either know Parametric or be assisted by someone who does. Once a spell scroll is used to learn its spell, it disintegrates. Spellbooks endure.