As an action, you can set this trap in an unoccupied space within 1 sqr. (1.5m) of you. The trap forms a saw-toothed steel ring that snaps shut when a creature steps on the pressure plate in the center. A Large or smaller creature that enters the trap’s space must succeed on a DC 13 Dexterity save or take 1d6 piercing damage and become grappled. A creature can use its action to make a DC 13 Strength (Athletics) check to free itself or another within reach. Each failed check deals 1 piercing damage to the trapped creature.