Albert the Steel Beetle

Might of the Master. The following numbers increase by 1 when your proficiency bonus increases by 1: the defender’s skill and saving throw bonuses (above), the bonuses to hit and damage of its rend attack, and the number of hit points restored by its Repair action (below).

Vigilant. The defender can’t be surprised.

Familiar. In combat, a familiar rolls its own initiative and acts on its own turn. A familiar can't attack, but it can take other actions as normal. When a familiar drops to 0 hit points, it disappears, leaving behind no physical form.

Force-Empowered Rend. Melee Weapon Attack: +4 to hit, reach 5 ft., one target you can see. Hit: 1d8 + 2 force damage.

Repair (3/Day). The magical mechanisms inside the defender restore 2d8 + 2 hit points to itself or to one construct or object within 5 feet of it.