Yuki Onna

Yuki Onna CR: 20

Medium , any

Armor Class: 20

Hit Points: 300

Speed: 40 ft , can hover

STR

12 +1

DEX

18 +4

CON

23 +6

INT

14 +2

WIS

20 +5

CHA

24 +7

Saving Throws: Dex +10, Wis +11

Skills: Stealth +10, Arcana +8, Perception +11, Deception +13

Damage Vulnerabilities: Fire

Damage Immunities: Cold

Condition Immunities: exhaustion, grappled, restrained, stunned

Challenge Rating: 20

Cha +13 to hit, DC 21

At will: Spirit Shroud (C), Rime's Binding Ice

1/day: Wall of Ice (C)

2/day: Cone of Cold, Cold Shield

3/day: Ice Storm

Preffered Terrain - Can sense the presence of any creature and their location within one mile, so long as they are within the Yuki Onna's snowy wilderness
Move through Snow - If the Yuki Onna is standing on snow, they can use their bonus action to misty step through the snow to another point of snow within 30 feet
Levitation - The Yuki Onna can hover up to 30 feet above the ground, and can move within that space at will

Actions

Multiattack - The Yuki Onna makes two Kisses of Death, and casts one spell
Kiss of Death - The Yuki Onna blows an icy cold kiss at a target. +10 to hit, 4d8+4 cold, 30/90. Targets hit by the kiss must beat a DC 21 Con save or have disadvantage on all dex based attack rolls, saves, and checks, and have their movement reduced by 10 till the end of their next turn

Reactions

Chilling Aura - When a melee attack is made against the Yuki Onna and hits, she can deal half the damaged dealt, rounded down, back to the target in cold damage

Legendary Actions

Legendary Resistance (3/Day) - If the Yuki Onna fails a saving throw, it can choose to succeed instead
Movement - Move up to 40 feet
Spell - Cast one spell
Energy Drain - The Yuki Onna tries to grasp their target to drain their energy. +10 to hit, 2d10+4 cold, melee. All damage taken by the target heals the Yuki Onna

Lair Actions

Frigid Wind - The blizzard winds intensify. Everyone takes 2d6 cold damage and are moved 5 feet in the direction of the wind. Ranged attacks are made with disavantage until the end of the turn. The Yuki Onna can use this abilitay as a free action on turns when it rolls a 5 or 6 on a d6 die
Icy Terrain - Any areas covered in snow within the Yuki Onna's lair count as rough terrain. Anyone other than the Yuki Onna that enters a patch of ice within the Yuki Onna's lair must beat a DC 16 dex save or be knocked prone