Magic Resistance: The Yuki-Onna have advantage on saving throws against spells and other magical effects.

Freezing Aura. The Yuki-Onna have a freezing aura that surrounds them in all directions. If a creature walks within 10 ft. of them they will need to make a DC 18 Constitution saving throw. The moment they walk within range and fail the check their movement speed is halved and they take 7 (2d6) cold damage and each following round within the aura. If the creature walks within 5 ft. of the Yuki-Onna the cold damage will be upped to 10 (3d6) cold damage. For each round within the aura the creature has to re-roll the Constitution saving throw.

Multiattack: The Yuki-Onna make three attacks with their claws or icicle attack.

Claws: Melee Weapon Attack: +10 to hit, Reach 5 ft. - One target - Hit: 10 (2d4 + 5) slashing damage plus 10 (3d6) cold damage.

Icicle: Ranged Weapon Attack: +10 to hit - Reach 60 ft. - One creature. Hit: 5 (1d10) piercing damage and the target must make a DC 18 Constitution saving throw. On a failed save a creature must take 14 (4d6) cold damage or half as much damage on a successful one.

Freezing Breath: Melee Weapon Attack: +10 to hit - Reach 5 ft. - One creature. Hit: 16 (4d6 + 2) force damage plus 24 (7d6) cold damage. If this effect reduces a creature’s hit point count to 0, the creature dies as the Yuki-Onna consumes their soul.