Chains of the Nether Realm

You target a creature and attempt to restrain them by turning their own shadow into a mess of binding black chains. At the start of each of the target's turn it must make a strength saving throw against your spell save DC. On a failure the target takes 1d4 necrotic damage and is restrained until the start of it's next turn; on a successful saving throw the creature takes no necrotic damage and has it's movement speed is reduced by half until the start of it's next turn.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, you can target one additional creature within range of the spell for each slot level above 3rd.