The caster pulls pieces of the Plane of Shadow into his/her own reality causing a 20-foot cube to fill with inky ribbons that turn the area into difficult terrain and wrap around nearby creaturese. Any creature that ends its turn in this area becomes restrained by the ribbons until the end of the next turn unless it makes a successful save vs. Dexterity saving throw. Once a creature suceeds this saving throw, it can't be restrained by the ribbons, but it's still affected by difficult terrain.