Steel Defender CR: Proficiency Bonus (PB) equals your bonus
Medium construct, any
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
Saving Throws: Dex +1 plus PB, Con +2 plus PB
Skills: Athletics +2 plus PB, Perception +0 plus PB × 2
Damage Immunities: poison
Condition Immunities: charmed, exhaustion, poisoned
Senses: darkvision 60 ft., passive Perception 10 + (PB × 2)
Languages: understands the languages you speak
Challenge Rating: 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.