Legendary Resistance (3/Day). If the Unthinkable fails a saving throw, it can choose to succeed instead.
Magic Resistance. The Unthinkable has advantage on saving throws against spells and other magical effects.
Discorporation. When Unthinkable drops to 0 hit points or dies, its essence travels back to the Ethereal Plane, and cannot act for a time.
Incomprehensible Presence. Each creature who is aware of the Unthinkable and has a maximum health of 100 or lower, must make a DC 24 Wisdom saving throw. On a success, the creature is stunned until they succeed again on a subsequent turn and is permanently afflicted with insanity. On a failure, the creature also takes 10d10 psychic damage. Creatures with a maximum health of 25 or lower automatically fail. All creatures that have above 100 hit points but are CR 19 or less must make a DC 24 Wisdom saving throw or be stunned for the turn. Creatures are immune to Incomprehensible Presence for 30 seconds after being affected.
Innate Spellcasting. The Unthinkable's innate spellcasting ability is Intelligence, Wisdom, or Charisma, your choice (spell save DC 25). It can innately cast the following spells, requiring no material components:
At will: Plane Shift (self, may cast while permeated),Teleport, Telekinesis.
1/day each: Weird, Foresight.
3/day each: Maze, Hallucinatory Terrain, Reverse Gravity, Banishment.
Multiattack. The Unthinkable makes three attacks: two with its Melt Mind and one with its Subvert Reality.
Melt Mind. Ranged Spell Attack: +18 to hit, range 240 ft., one target. Hit: 45 (8d10) psychic damage.
Subvert Reality. The Unthinkable emits an aura of an alien, cosmic, pressure in a 100 ft. sphere centered on it self. All other creatures must make a DC 22 Wisdom saving throw. On a failure, they take 15d10 psychic damage and are stunned. On a success, they take half as much.
The tarrasque can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The tarrasque regains spent legendary actions at the start of its turn.
Attack. Unthinkable uses Melt Mind.
Move. Unthinkable may move its full speed and cast one of the following: Plane Shift (self, may cast while permeated) or Teleport (self).
Cerebral Ruin (Costs 2 Actions). Ranged Spell Attack: +21 to hit, range 120 ft., one target. Hit: 61 (11d10) psychic damage. Unthinkable focuses its power into the heart of its target's spinal cord. They are automatically paralyzed and will stay this way until they succeed a DC 21 Wisdom saving throw on their turn.
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