Cranial Rupture. If the puppeteer is killed while it is controlling a target, the target that was controlled take 1d4 psychic damage.

Subservient. The Aboleth puppeteer is fully under the control of the nearest Aboleth, and will follow directions immediately and unquestioningly.

Horrific Appearance. Any creature that starts its turn within 5 feet of the puppeteer must make a DC 10 wisdom saving throw (or a Sanity saving throw if you are using the optional rules presented in the DM’s guide) or be frightened by the puppeteer.

Puppeteer. As an action, the puppeteer attempts to lach on a target and seize control of it. The target must succeed on a DC 18 dexterity saving throw or the puppeteer laches on to the back of the target. The target is fully under the control of the puppeteer. The puppeteer’s AC becomes the AC of its controlled target + 1.

Bite. Melee Weapon Attack: +6 to hit, reach 5ft., 1 target. Hit: 8 (1d12 + 2) piercing damage. 

Tentacle. RangedWeapon Attack: +6 to hit, range 15/25ft., 1 target. Hit: 5 (1d6 + 2) poison damage.