Steel Defender

The defender can't be surprised.

Melee Weapon Attack: your spell attack modifier to hit, reach 5 ft., one target you can see. Hit: 1d8 + PB force damage.

The magical mechanisms inside the defender restore 2d8 + PB hit points to itself or to one construct or object within 5 feet of it.

The defender imposes disadvantage on the attack roll of one creature it can see that is within 5 feet of it, provided the attack roll is against a creature other than the defender.