Shadow Trap

You pin the target’s shadow to its current location, causing the target to become entangled and preventing it from moving farther than 5 feet from its original position, as if its shadow were anchored to the terrain. Each round on its turn, the target can attempt a new saving throw to end the effect as a full-round action. A flying creature can only hover in place or fall while entangled in this manner. This spell automatically fails when cast on a creature that doesn’t throw a shadow, and it ends if the creature is entirely in an area with no illumination.