Brain Breaker

The brain breaker is aware of creatures within 1 mile of itself that have an Intelligence score of 4 or higher. It knows the distance and direction to each creature, as well as each one's Intelligence score, but can't sense anything else about it. A creature protected by a Mind Blank spell, a Nondetection spell, or similar magic can't be perceived in this manner.

The brain breaker has advantage on saving throws against spells and other magical effects.

The brain breaker can use its telepathy to initiate and maintain telepathic conversations with up to ten creatures at a time. The brain breaker can let those creatures telepathically hear each other while connected in this way.

The brain breaker makes two Tentacle attacks.

Melee Weapon Attack +6 to hit, reach 30 ft., one target. 15 (3d8 + 2) Bludgeoning damage. If the target is a Huge or smaller creature, it has the Grappled condition (escape DC 14) and takes 9 (1d8 + 5) Psychic damage at the start of each of its turns until the grapple ends. The brain breaker can have up to four targets Grappled at a time.

Creatures of the brain breaker's choice within 60 feet of itself must succeed on a DC 17 Intelligence saving throw or take 32 (5d10 + 5) Psychic damage and have the Stunned condition for 1 minute. A Stunned creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

The brain breaker targets one creature with the Incapacitated condition that the brain breaker senses with its Creature Sense trait and establishes a psychic link with the target. Until the link ends, the brain breaker can perceive everything the target senses. The target becomes aware that something is linked to its mind once it no longer has the Incapacitated condition, and the brain breaker can terminate the link at any time (no action required). The target can use an action on its turn to attempt to break the link, doing so with a successful DC 17 Charisma check. If the target breaks the link this way, the target takes 10 (3d6) Psychic damage. The link also ends if the target and the brain breaker are more than 1 mile apart. The brain breaker can form psychic links with up to ten creatures at a time.