Shadow Shackles

7th level conjuration

Casting Time: 1 action

Components: V, S, M (a chunk of tungsten)

Range: 120 feet

Duration: Concentration, up to 10 minutes

You cast the target of this spell into a set of shadow shackles, as you command your magic-infused shadow to confine the target, molding it into one shackle per arm and leg.

The creature affected must make a Dexterity saving throw. On a failed save, your shadow anchors the target to the spot, preventing any movement—the target has effectively a Speed of 0 ft., but is not restrained. On a successful save, the spell ends. Additionally, for as long as even a single one of the shadowy chains remains, the target must make a Constitution saving throw each round. On a failed save, the target receives 3d6 cold damage.

Shadow shackles have an AC of 18, a damage threshold of 10 and 20 hit points. The spell remains in effect until you cease to concentrate or until the shadow shackles are destroyed, whereupon your shadow crawls back to you to reassemble. This reassembly takes 5 rounds, during which you have no functional shadow. You can only cast this spell if you have a shadow.