Snow Queen

Ice Climb. When climbing on ice, the Snow Queen has a climbing speed of 20 feet, and she can climb difficult surfaces made of ice and snow, including upside down on ceilings, without needing to make an ability check.

Icy Weapons. The Snow Queen's weapon attacks are magical. When she hits with any weapon, the weapon deals an extra 2d6 cold damage (included in the attack).

Legendary Resistance (3/Day). If the Snow Queen fails a saving throw, she can choose to succeed instead.

Snowsight. The Snow Queen can see through areas obscured by snowfall, sleet, rain, and other wintry precipitation without penalty.

Snow Walk. The Snow Queen can move across icy surfaces without needing to make an ability check. Additionally, difficult terrain composed of ice or snow doesn't cost her extra movement.

Multiattack. The Snow Queen makes two Claw or Ice Bolt attacks.

Claw. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) slashing damage plus 7 (2d6) cold damage.

Ice Bolt. Ranged Spell Attack: +10 to hit, range 120 ft., one target. Hit: 13 (2d8 + 4) piercing damage plus 7 (2d6) cold damage. The target's speed is reduced by 10 feet until the end of its next turn.

Cold Snap (Recharge 5-6). The Snow Queen causes the temperature around her to drop dramatically. Each creature without 30 feet of the Snow Queen must make a DC 18 Constitution saving throw. On a failure, a creature takes 42 (12d6) cold damage and suffers one level of exhaustion. On a success, a creature takes half the damage and doesn't suffer exhaustion. A creature that is immune to cold damage doesn't suffer exhaustion, even if it fails the saving throw. A creature that fails the saving throw by 5 or more is petrified in ice for 1 minute. A petrified creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. A petrified creature that takes fire damage has advantage on the saving throw to end the effect.

Attack. The Snow Queen makes a Claw or Ice Bolt attack.

Move. The Snow Queen moves up to her speed without provoking opportunity attacks.

Snowblind. One creature the Snow Queen can see within 120 feet of her must succeed on a DC 18 Dexterity saving throw or be blinded by swirling snow until the end of its next turn.

Wintry Swirl (Costs 2 Actions). Each creature within 15 feet of the Snow Queen must succeed on a DC 18 Constitution saving throw or have vulnerability to cold damage until the end of its next turn. A creature with immunity to cold damage that fails this saving throw instead loses its immunity to cold damage but isn't vulnerable to it.