Vigilant:
The defender can't be surprised.
Actions (Requires Your Bonus Action)
Force-Empowered Rend.
Melee Weapon Attack: your spell attack modifier 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.
Reactions
Deflect Attack.
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.