Brain in a Jar

The brain magically senses the location of any creature within 300 feet of itself that has an Intelligence score of 3 or higher, regardless of interposing barriers.

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

The brain casts one of the following spells, requiring no spell components and using Intelligence as the spellcasting ability (spell save DC 14):

At will: Charm Person, Detect Thoughts, Mage Hand

1/day each: Compulsion, Hold Person (level 3 version)

The brain makes two Disrupting Burst attacks.

Melee or Ranged Attack Roll: +6, reach 5 ft. or range 120 ft. Hit: 11 (2d6 + 4) Psychic damage. The target can't take Reactions until the end of its next turn, and it has Disadvantage on saving throws to maintain Concentration until the end of its next turn.

Intelligence Saving Throw: DC 14, each creature in a 60-foot Cone. Failure: 14 (4d6) Psychic damage, and the target has the Incapacitated condition until the end of the brain's next turn. Success: Half damage only.