The Codex of Shadows

Chronicles the origins of shadow magic and the dark entities that inhabit the void between worlds. Describes a being called the Demiurge and the fall of civilizations that dared to harness its power.

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

Shadow of Moil
4th-level necromancy

Casting Time: 1 action
Range: Self
Duration: Concentration, up to 1 minute

Flame-like shadows wreathe your body until the spell ends, causing you to become heavily obscured to others. The shadows turn dim light within 10 feet of you into darkness, and bright light in the same area to dim light.

Until the spell ends, you have resistance to radiant damage. In addition, whenever a creature within 10 feet of you hits you with an attack, the shadows lash out at that creature, dealing it 2d8 necrotic damage.

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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.