Difficult terrain that pertains to harsh, cold climates do not impose disadvantage on ability checks for the Yuki-Onna, and the abundance of snow and ice gives them advantage on Wisdom (Survival) and Dexterity (Stealth) checks as they blend in with the snowy backdrop. Their cold bodies thrive in freezing temperatures and as such cannot be damaged by the cold, no matter the state of undress or process by which the cold is applied to them. 

Yuki-Onna are able to produce snow and ice at will, and control this ice with perfect accuracy, in addition to any ice that was already present in the surrounding area; up to 5 cubic feet at a time, and at a range up to 60 ft. Starting at 3rd level, you also gain the ability to cast Armor of Ice once per day as an action.

Yuki-Onna have the ability to create icy variants of melee weapons based on properties of said weapons; these properties are the: Light, Versatile, Reach, and Heavy properties.

On your turn, as a special action, you can conjure a weapon made of ice that has one of the following properties:

• Light: The conjured weapon deals 1d6 of slashing damage and has the light property.
• Reach: The conjured weapon deals 1d6 of piercing damage and has the reach property.
• Versatile: The conjured weapon deals 1d8 (1d10, two-handed) slashing damage and has the versatile property.
• Heavy: The conjured weapon deals 1d12 bludgeoning damage and has the heavy property.

Weapons conjured in this way use your Wisdom score as their primary stat and last for an hour, after which they vanish and leave behind a small pile of snow.

Being born of ice gives the Yuki-Onna extreme advantages in the coldest parts of the world, but this in turn leaves them incredibly vulnerable to extreme and heat, and to fire especially. Yuki-Onna take double damage from fire, and when in the field, being in close proximity to extreme heat (i.e. on top of an active volcano, inside a burning building, standing too close to a fire or a pool/river of lava) imposes disadvantage on all saving throws, as well strength and dexterity related ability checks. These effects can be negated if the Yuki-Onna dons any sort of item or equipment that either protects against heat or lowers their body temperature, is currently the effects of the Investiture of Ice spell, or if an outside force manages to lower the temperature of the surrounding area significantly.

Yuki-Onna mature at the same rate as humans, reaching adulthood around the ages of 18 to 21, and can live up to 300 years old.

Yuki-Onna are typically very in tune with the world around them, and are very adept at reading the intentions of, and manipulating, others.

Your Wisdom score increases by 2.

Your Charisma score increases by 1.

Your base walking speed is 30 feet.

You can read, speak, and write Common and Primordial.

Yuki-Onna live largely disconnected from the rest of the world, and thus rarely make note other traditions and cultures, though those that do venture into nearby towns will mostly abide the law, if only as to not draw too much attention to themselves. Most Yuki-Onna tend to lean towards True Neutral, though it is not uncommon for experience with other races to cause them to begin to lean more Neutral good or evil.

Yuki-Onna are usually comparable in size to an average human, ranging anywhere from 5 feet tall to 6 feet tall. Yuki-Onna typically have very slender builds, and are considered medium creatures.

Yuki-Onna, though typically neutral, when angered or provoked are particularly deadly with precise strikes and weaponry.

You gain proficiency with Daggers and Sickles.