Grappler. The Brainstealer dragon has advantage on attack rolls against any creature grappled by it.
Legendary Resistance (2/Day). If the dragon fails a saving throw, it can choose to succeed instead.
Multiattack. The dragon can use its Frightful Presence or mind blast. It then makes three attacks: one with its bite and two with its Tentacles.
Bite. Melee Weapon Attack: +12 to hit, reach 10 ft., one target. Hit: 18 (2d10 + 7) piercing damage.
Tentacles. Melee Weapon Attack: +12 to hit, reach 5 ft., one target. Hit: 14 (2d6 + 7) bludgeoning damage.
Extract Brain. Melee Weapon Attack: +7 to hit, reach 5 ft., one incapacitated humanoid grappled by the Brainstealer dragon. Hit: The target takes 55 (10d10) piercing damage. If this damage reduces the target to 0 hit points, the Brainstealer dragon kills the target by extracting and devouring its brain.
Mind Blast (Recharge 5–6). The Brainstealer dragon magically emits psychic energy in a 60-foot cone. Each creature in that area must succeed on a DC 15 Intelligence saving throw or take 22 (3d8 + 4) psychic damage and be stunned for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
Frightful Presence. Each creature of the dragon's choice that is within 120 feet of the dragon and aware of it must succeed on a DC 17 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the dragon's Frightful Presence for the next 24 hours.
The dragon 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 dragon regains spent legendary actions at the start of its turn.
Detect. The dragon makes a Wisdom (Perception) check.
Tentacles Attack. The dragon makes a tentacles attack.
Mind blast Attack. The dragon makes a mind blast attack.
Extract brain Attack. The dragon makes a Extract brain attack.
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