Brain Sentry

Detect Sentience. The brain sentry can sense the presence and location of any creature within 300ft of it that has an Intelligence of 8 or higher, regardless of interposing barriers, unless the creature is protected by the Mind Blank spell.

Alarm. The Brain Sentry sends out a psychic pulse alerting allies, within 1000ft.

Multiattack. The brain sentry makes two tentacle attacks, and uses psychic burst.

Tentacles. Melee weapon attack: +6 to hit, reach 10ft., one target.  Hit: 8 (1d4+6) Slashing, 9 (1d6+6) Lightning damage. Target must make a DC 14 Intelligence saving throw on failure the target becomes stunned until the end of its next turn.

Psychic Burst. The Brain Sentry releases a burst of psychic energy in a 15ft. sphere centered on itself. Each creature hit must makes a DC 14 Intelligence saving throw or take 7 (2d4+2) psychic damage and become stunned for 1 min. The stunned creature can repeat its saving throw at the end of each turn.

Entangle. The Brain Sentry targets one stunned creature and begins to wrap around it, the Target must make an Intelligence saving throw DC 12, on a failure the creature becomes restrained as its nervous system is overridden by the Brain Sentry. The Brain Sentry gains 3/4 cover, and all stats and abilities become the same as the creature that's entangled. The restrained creature takes (3d6+2) lightning damage and can repeat its saving throw at the end of each turn. If the Brain Sentry is forcibly removed DC15 Strength The entangled creature takes (8d6) lightning damage and has disadvantage on all attack rolls, and ability checks, for 1 min.