Steel Defender
Medium construct
Armor Class: 15 (natural armor)
Hit Points: 2 + your Intelligence modifier + 5 times your artificer level (the defender has a number of Hit Dice [d8s] equal to your artificer level)
Speed: 40 ft.
STR DEX CON INT WIS CHA 14 (+2) 12 (+1) 14 (+2) 4 (−3) 10 (+0) 6 (−2) Saving Throws: Dex +1 plus PB, Con +2 plus PB
Skills: Athletics +2 plus PB, Perception +0 plus PB x 2
Damage Immunities: poison
Condition Immunities: charmed, exhaustion, poisoned
Senses: darkvision 60 ft., passive Perception 10 + (PB x 2)
Languages: understands the languages you speak

Proficiency Bonus (PB): equals your bonus
Vigilant. The defender can't be surprised.

Actions

Force-Empowered Rend. Melee Weapon Attack: your spell attack modifier to hit, reach 5 ft., one target you can see. Hit: 1d8 + PB force damage.
Repair (3/Day). The magical mechanisms inside the defender restore 2d8 + PB 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.