Steel Defender

Medium construct, -
Armor Class 15 (natural armor)
Hit Points 2 + your Intelligence modifier + five times your artificer level (the defender has a number of Hit Dice [d8s] equal to your artificer level)
Speed 40 ft.
STR
14 (+2)
DEX
12 (+1)
CON
14 (+2)
INT
4 (-3)
WIS
10 (+0)
CHA
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
Challenge -     Proficiency Bonus 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.

See the Battle Smith artificer's subclass.
Rules (Tasha´s Cauldron of Everything)