As you pull on both ends of chain in front of you and making the line taut, it becomes a magical conduit that creates a chain tether between two targets that you can see within range, that are no more than 15 feet apart from one another.
The chain creates a shackle on both sides that binds the creatures together. While bound, a creatures movement speed is halved, and they cannot move more than 15 feet apart from one another. If a creature tries to use teleportation or interplanar travel to escape from the shackle, it must first make a Charisma saving throw. On a success, the creature can use that magic to become untethered. On a failure, the creature can't exit the shackle and wastes the use of the spell or effect.
It is immune to all damage and can't be dispelled by Dispel Magic. A Disintegrate spell destroys the chain and shackles instantly, however. The chain also extends into the Ethereal Plane, blocking ethereal travel.
* - (a 1 ft. long mithril or adamantine chain)