The Tome of the Damned

Said to have been written by a cabal of ancient necromancers and demonic cultists, this tome's pages are made from the skin of a fallen angel and inked with the blood of the demons. It includes maps and descriptions of the various layers of Hell and other lower planes' realms, plus guides on navigating these treacherous landscapes and avoiding the entities that inhabit them.

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

Summon Lesser Demons
3rd-level conjuration

Casting Time: 1 action
Range: 60 feet
Duration: Concentration, up to 1 hour

You utter foul words, summoning one demon from the chaos of the Abyss. Roll on the following table to determine what appears.

1d6 ... Demons Summoned
1-2 ... Two demons of challenge rating 1 or lower
3-4 ... Four demons of challenge rating 1/2 or lower
5-6 ... Eight demons of challenge rating 1/4 or lower

The DM chooses the demons, such as manes or dretches, and you choose the unoccupied spaces you can see within range where they appear. A summoned demon disappears when it drops to 0 hit points or when the spell ends.

The demons are hostile to all creatures, including you. Roll initiative for the summoned demons as a group, which has its own turns. The demons pursue and attack the nearest non-demons to the best of their ability.

As part of casting the spell, you can form a circle on the ground with the blood used as a material component. The circle is large enough to encompass your space. While the spell lasts, the summoned demons can't cross the circle or harm it, and they can't target anyone within it. Using the material component in this manner consumes it when the spell 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.