Black Ribbons

You pull pieces of the plane of shadow into your own reality, causing a 20-foot cube to fill with inky ribbons that turn the area into difficult terrain and wraps around nearby creatures. Any creature that ends its turn in the area must make a Dexterity Saving Throw or be restrained by the ribbons until the end of its next turn. Once a creature succeeds, they cannot be restrained by the ribbons again but are still affected by the difficult terrain.