[Infernal] Item - Tormented Chain

My initial idea for this was just a basic black chain but it kinda looked pretty boring. Things came together when I decided to add a fiendish head to it so now it's more like an ... evil snake?

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Sometimes the animated chains of a chain devil find freedom from the devil's control, sustained by an outside source of magic. They slither wildly among the Cinderdeep until tempered by the attunement of another creature.

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Tormented Chain
Wondrous item, uncommon (requires attunement)

This 20-foot long barbed chain is an object with AC 16, 15 hit points, resistance to piercing damage, and immunity to psychic and poison damage. While attuned to the chain, you can speak its command word (no action required) to magically animate it. The chain remains animated for 1 minute or until it is reduced to 0 hit points. While the animated chain is within 60 feet of you, you can use an action to command it to move up to 20 feet and take one of the following actions:  

• Bind. The chain flies to a Medium or smaller target of your choice within 20 feet of it and attempts to wrap itself around it. The target must succeed on a DC 13 Strength saving throw or be grappled. The target remains grappled until it uses an action to repeat the save and succeeds, or until the chain is otherwise destroyed or removed. While grappling a target, the chain can only be commanded to take the Lash action against the grappled target, which has disadvantage on the saving throw.  
• Extend. The chain levitates and extends itself between two points of your choice within 20 feet of each other. The chain remains rigid until you command it to retract using another bonus action. While extended this way, the chain can support up to 500 pounds.  
• Lash. The chain whips out at a creature within 5 feet of it. The target must succeed on a DC 13 Dexterity saving throw or take 1d6 piercing damage. This damage is magical.

You can animate the chain once and can't do so again until you finish a short or long rest, during which the chain regains any lost hit points. 

Rare Variant. The chain's saving throws for Bind and Lash are 15 instead. It also has AC 18 and 20 hit points.

Very Rare Variant. The chain's saving throws for Bind and Lash are 17 instead. It also has AC 20 and 30 hit points.