Adult White Dragon

The adult white dragon can move across and climb icy surfaces without needing to make an ability check. Additionally, difficult terrain composed of ice or snow doesn't cost it extra movement.

3/day. If the adult white dragon fails a saving throw, it can choose to succeed instead.

3 legendary actions; one at a time at the end of another creature’s turn, regaining spent uses at the start of its turn

Melee Weapon Attack: +11 to hit, reach 10 ft.. Hit: 17 (2d10 + 6) piercing plus 4 (1d8) cold damage.

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

The adult white dragon can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.

Recharge 5–6. The adult white dragon exhales an icy blast of hail in a 60-foot cone. Each creature in that area must make a DC 19 Constitution saving throw, taking 54 (12d8) cold damage on a failed save, or half as much damage on a successful one.

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

Each creature of the adult white dragon's choice that is within 120 ft. of the dragon and aware of it must succeed on a DC 14 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 adult white dragon's Frightful Presence for the next 24 hours.

The adult white dragon makes a Wisdom (Perception) check.

The adult white dragon makes a tail attack.

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