The Arcane Anthology of Forbidden Magicks

The anthology mentions lost spells deemed too dangerous or morally reprehensible for magical practice, including condemnation of ancient Atlantean mages for using such spells to "shatter the demiurge into 27 pieces," a vague statement without further context. None of the descriptions lend themselves to casting or learning such spells. The text also mentions several deities of magic who may pursue anyone attempting to reconstruct such spells.

A section of the book's text also functions as a one-time use Scroll of Protection Vs. Celestials.

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SCROLLS OF PROTECTION

Usable by any class, not just a spellcaster. Each scroll of protection works against a specific type of creature as listed.

Using an action to read the scroll encloses you in a invisible barrier that extends from you to form a 5-footradius, 10-foot-high cylinder. For 5 minutes, this barrier prevents creatures of the specified type from entering or affecting anything within the cylinder.

The cylinder moves with you and remains centered on you. However, if you move in such a way that a creature of the specified type would be inside the cylinder, the effect ends.

A creature can attempt to overcome the barrier by using an action to make a DC 15 Charisma check. On a success, the creature ceases to be affected by the barrier.