Once per short rest: The brain can sense the presence and location of any creature within 300 feet of it that has an Intelligence of 3 or higher, regardless of interposing barriers, unless the creature is protected by a mind blank spell. 

Use your spellcasting ability and once per day you can cast one of these spells: detect thoughts, mage hand, zone of truth, charm person, hold person

 The brain doesn't require air, food, drink, or sleep.

magically emit psychic energy in a 60-foot cone. Each creature in that area must succeed on a  Intelligence saving throw or take (3d8 ) psychic damage and be stunned for 3 rounds of combat, (18 seconds) . A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.