Ancient Warforged Repair Sentinel, Lesser

Keen Hearing. The Repair Sentinel has advantage on Wisdom (Perception) checks that rely on hearing.

Spider Climb. The spider can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Death Throes. When the Repair Sentinel is reduced to 0 hit points, it is destroyed. If it's Fire Breath or Acid Stream have not been used or has recharged (5-6), the tank used to store the volatile chemicals ruptures, subjecting anyone within 10-feet to the effects. Each creature in that area must make a DC 12 Dexterity saving throw, taking 21 (6d6) fire or acid damage on a failed save, or half as much damage on a successful one.

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 11 (2d8 + 3) piercing damage.

Fire Breath (Recharge 5–6). The Repair Sentinel exhales fire in a 15-foot cone. Each creature in that area must make a DC 12 Dexterity saving throw, taking 21 (6d6) fire damage on a failed save, or half as much damage on a successful one.

Acid Stream (Recharge 5–6). The Repair Sentinel expels a stream of acid in a 5-foot stream, 30-feet long. Each creature in that area must make a DC 12 Dexterity saving throw, taking 21 (6d6) acid damage on a failed save, or half as much damage on a successful one.

Chain Whip - Entangle (Recharge 5–6). Ranged Weapon Attack: +5 to hit, range 30 ft., one creature. Hit: The target is restrained by a chain whip. As an action, the restrained target can make a DC 12 Strength check, bursting the webbing on a success. The chain can also be attacked and destroyed (AC 10; hp 5; invulnerable to fire damage; immunity to bludgeoning, poison, and psychic damage). On a subsequent turn, the Repair Sentinel can reel in a restrained victim 30-feet, provided it does not move, as a bonus action.

Chain Whip - Disarm (Recharge 5–6). Ranged Weapon Attack: +5 to hit, range 30 ft., one creature. Hit: The target makes a DC 15 Strength check or is disarmed. The weapon lands in the Repair Sentinel's square.