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.