The Forbidden Folio of Notions

Those who study its pages risk becoming undone by conceptual entropy due to instructions for dangerous psionic mental exercises. Of historical value, the book's nameless author claims such practices led the ancient Atlanteans to find "the psychic mote in the Astral Void" that eventually became the demiplane of Otherwhere.

Among the text are pages that function as a spell scroll...

Psychic Scream
9th-level enchantment

Casting Time: 1 action
Range: 90 feet
Duration: Instantaneous

You unleash the power of your mind to blast the intellect of up to ten creatures of your choice that you can see within range. Creatures that have an Intelligence score of 2 or lower are unaffected.

Each target must make an DC 19 Intelligence saving throw. On a failed save, a target takes 14d6 psychic damage and is stunned. On a successful save, a target takes half as much damage and isn't stunned. If a target is killed by this damage, its head explodes, assuming it has one.

A stunned target can make an DC 19 Intelligence saving throw at the end of each of its turns. On a successful save, the stunning effect ends.

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SPELL SCROLL RULES (DMG p. 200)

When using a spell scroll, the spell must be on a caster's class spell list to use as an action (no need to provide any spell's components). Otherwise, the scroll is unintelligible.

If the spell is on a character's class spell list but of a higher level than can normally be cast, the character must make an ability check using the usual class-related spellcasting ability (Intelligence, Wisdom, or Charisma) to determine whether it is cast successfully. The DC equals 10 + spell's level. On a failed check, the spell disappears from the scroll with no other effect.

REQUIRED SPELLCASTING ABILITY CHECK
* Cantrip (Common) ... DC 10
* 1st Level Spell (Common) ... DC 11
* 2nd Level Spell (Uncommon) ... DC 12
* 3rd Level Spell (Uncommon) ... DC 13
* 4th Level Spell (Rare) ... DC 14
* 5th Level Spell (Rare) ... DC 15
* 6th Level Spell (Very rare) ... DC 16
* 7th Level Spell (Very rare) ... DC 17
* 8th Level Spell (Very rare) ... DC 18
* 9th Level Spell (Legendary) ... DC 19

Once the spell is cast, the words on the scroll fade, and those pages within the book fall out as dust.