Might of Master: The following numbers increase by 1 when your proficiency bonus increases by 1: the iron defender’s skill bonuses, the bonuses to hit and damage of its bite, and the number of hit points restored by its Repair action.
Bite: Melee Weapon Attack: +4 to hit, reach 5 ft, one target you can see. Hit: 1d8 + 4 piercing damage
Repair(3/day): he magical mechanisms inside the iron defender restore 2d8 + 2 hit points to itself or to one construct or object within 5 feet of it.
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REACTIONS
Defensive Pounce: The iron 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 iron defender.