Frostbite Caltrops

Rare Wondrous Item
Single use

Cold 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 16). On a failed save they stop moving and take 4d6 Cold damage. Until the creature regains at least 1 hit point, its walking speed is reduced by 20ft. A creature moving through the area at half speed makes the saving throw with advantage. The caltrops turn into snow 24 hours after they have been scattered.

Variant of
Arcane Imbued Caltrops