Gravegrasp Caltrops

Grasped Feet. As an action, you can spread this bag of caltrops to cover a 5ft. square area. Any creature that enters the area must make a Dexterity saving throw (DC 15). On a failed save, they take 1d4 Piercing and 2d6 Necrotic damage, and the caltrops conjure dark skeletal hands from the ground. These hands wrap around the creature, and they become Restrained for up to one minute. If a creature is Restrained by these caltrops at the end of their turn, they take 2d6 Necrotic damage. A creature can use an action to free themselves by making an Athletics or Acrobatics check (DC 15). The caltrops lose their magic and turn to ashes 48 hours after they have been scattered.