Draconic Immunity. The dragon cannot be put to sleep by magic.

Metalsense. The dragon can supernaturally sense non-precious metals (such as iron, steel, or bronze) within 90 feet of themself if the metal is not behind total cover. The dragon cannot be surprised by any creature using armor or weapons made from non-precious metals.

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

Multiattack. The dragon can use their Frightful Presence. They then make three attacks: one with their Bite and two with their Claws.

Bite. Melee Weapon Attack: +11 to hit, reach 10 ft., one target. Hit: 17 (2d10 + 6) Piercing damage plus 7 (2d6) Cold damage.

Claw. Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 13 (2d6 + 6) Slashing damage.

Tail. Melee Weapon Attack: +11 to hit, reach 15 ft., one target. Hit: 15 (2d8 + 6) Bludgeoning damage.

Frightful Presence. Each creature of the dragon's choice that is within 120 feet of the dragon and aware of it must succeed on a DC 16 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the dragon's Frightful Presence for the next 24 hours.

Breath Weapons (Recharge 5–6). The dragon uses one of the following breath weapons.

Cold Breath. The dragon exhales an icy blast in a 30-foot cone. Each creature in that area must make a DC 17 Constitution saving throw, taking 40 (9d8) cold damage on a failed save, or half as much damage on a successful one.

Paralyzing Breath. The dragon exhales a stream of icy crystal in a 90-foot line that is 5 feet wide. Each creature in that area must succeed on a DC 17 Constitution saving throw or have their Dexterity score reduced by 4 (1d8). A creature's Dexterity score is reduced until they complete a short or long rest.

Spellcasting. The dragon casts one of the following spells, requiring no spell components and using Charisma as the spellcasting ability (spell save DC 14):

1/day each: Shape Water, Pass Without Trace, Rime’s Binding Ice

The dragon can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The dragon regains spent legendary actions at the start of its turn.

Detect. The dragon makes a Wisdom (Perception) check.

Tail Attack. The dragon makes a Tail attack.

Wing Attack (Costs 2 Actions). The dragon beats its wings. Each creature within 10 feet of the dragon must succeed on a DC 19 Dexterity saving throw or take 13 (2d6 + 6) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.