The hoarfrost drake creates a cloud of freezing fog that rimes everything in frost. Each creature within 20 feet of it must make a DC 14 Constitution saving throw. On a failure, the target takes 14 (4d6) cold damage and must succeed on a DC 12 Dexterity saving throw or drop whatever it's holding. On a success, the target takes half the damage and doesn't drop what it's holding. The area becomes difficult terrain until the end of the hoarfrost drake's next turn. A creature that enters the area or ends its turn there must succeed on a DC 14 Dexterity saving throw or fall prone.