The Palimpsest

large aberration (aberration), lawful-evil · CR sixteen

by Anonymous

Armor Class: 18

Hit Points: 273

Speed: 30 ft., fly 40 ft.

Saving Throws: constitution, intelligence, wisdom, charisma

Damage Resistances: Bludgeoning (nonmagical), Piercing (nonmagical), Slashing (nonmagical)

Damage Immunities: Psychic

Condition Immunities: Charmed, Frightened

Senses: truesight 120 ft., passive Perception 19

Languages: Common, Deep Speech

Challenge: sixteen

STR 16 (+3)

DEX 14 (+2)

CON 20 (+5)

INT 22 (+6)

WIS 18 (+4)

CHA 21 (+5)

Traits

Legendary Resistance (3/Day). If the creature fails a saving throw, it can choose to succeed instead.
Magic Resistance. The creature has advantage on saving throws against spells and other magical effects.
Aura of Unwriting. Reality blurs within 15 feet of the palimpsest. A creature that starts its turn there must succeed on a DC 19 Intelligence saving throw or have one nonpermanent benefit it is currently enjoying (such as a spell concentration, a rage, or an active class feature) erased until the end of its next turn. A creature that succeeds is immune to this aura until the start of its next turn.

Erasing Touch. On a hit, the target's hit point maximum is reduced by an amount equal to the force damage dealt as a page of its being is rewritten blank. The reduction lasts until the target finishes a long rest, and the target dies if this reduces its maximum to 0.
Unmaking Word. The palimpsest speaks a word that was never written. The target must succeed on a DC 19 Intelligence saving throw or, on a failure, also forget one prepared spell or one feature that requires a short or long rest to recharge, until it finishes a long rest.

Transpose. The palimpsest rewrites two coordinates as one. It and one creature it can see within 60 feet instantly swap places. An unwilling creature can negate the swap with a successful DC 19 Charisma saving throw.

Redact the Blow. The palimpsest revises the last instant: it halves the triggering damage, and the creature that dealt it must succeed on a DC 19 Intelligence saving throw or forget that it acted at all, taking no further reactions until the end of its next turn.