Alpha Winter Wolf

Keen Hearing and Smell. The wolf has advantage on Wisdom (Perception) checks that rely on hearing or smell.

Pack Tactics. The 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 isn't incapacitated.

Snow Camouflage. The wolf has advantage on Dexterity (Stealth) checks made to hide in snowy terrain.

Action Melee Attack. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 16 (2d8 + 8) piercing damage.  If the target is a creature, it must succeed on a DC 18 Strength saving throw or be knocked prone.

Cold Breath (Recharge 4-6). The wolf exhales a blast of freezing wind in a 25-foot cone. Each creature in that area must make a DC 18 Dexterity saving throw, taking 24 (6d8) cold damage on a failed save, or half as much damage on a successful one.