Winter Wolf

The winter wolf has Advantage on an attack roll against a creature if at least one of the wolf's allies is within 5 feet of the creature and the ally doesn't have the Incapacitated condition.

Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 11 (2d6+4) piercing damage. If the target is a Large or smaller creature, it has the Prone condition.

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