Armor Class. 11 + PB (Natural armor)

Temporary Hit Points. 3 times the rider’s character level or challenge rating.

Mounted. During a long rest, Yokan can designate one creature that rode it within the last 10 days as its rider. He gains temporary hit points equal to 3 times the rider’s level or challenge rating after completing the long rest. Yokan uses its rider’s proficiency bonus in place of its own proficiency bonus for AC, ability checks, attack rolls, saving throws, and the DC made to save against certain action effects.

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

Pack Tactics. Yokan 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. Yokan has advantage on Dexterity (Stealth) checks made to hide in snowy terrain.

Bite. Melee Weapon Attack: +4 + PB to hit, reach 5 ft., one target. Hit: 2d6 + 4 piercing damage. If the target is a creature, it must succeed on a DC 12 + PB Strength saving throw or be knocked prone.

Cold Breath (Recharge 5–6) (1/Day). Yokan exhales a blast of freezing wind in a 15-foot cone. Each creature in that area must make a DC 10 + PB Dexterity saving throw, taking 4d8 cold damage on a failed save, or half as much damage on a successful one.