Chains of Ul

You conjure arcane chains that appear from the ground in an unoccupied space of your choice that you can see within range. When you cast this spell, you can direct the chain to wrap around a target within 60 feet of the chain. That creature must succeed on a Strength saving throw or be incapacitated. As a bonus action until the spell ends, you can direct the chain to tighten around the restrained target. The target must succeed on a Constitution saving throw or take 3d6 bludgeoning damage.