Cold Breath - Winter Wolf

Monster Manual - 5e, D&D Basic Rules

Cold Breath (Recharge 5–6 ). The wolf exhales a blast of freezing wind in a 15-foot cone. Each creature in that area must make a DC 12 Dexterity saving throw, taking 18 ( 4d8 ) cold damage on a failed save, or half as much damage on a successful one.