Cursed Dragon of Pride

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

Amphibious. The dragon can breathe air and water.

Magic Weapon. Prides weapon attacks are all magic.

Lucky. Cursed dragon of pride has the lucky feat

Multiattack. The Cursed Dragon of Pride can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.

Bite. Melee Weapon Attack: +14 to hit, reach 15 ft., one target. Hit: 19 (2d10 + 8) piercing damage. on a hit the target creature makes a DC 19 con save on failed takes 2d10 Psychic damage

Claw. Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 15 (2d6 + 8) slashing damage. on a hit the target creature makes a DC 19 con save on failed takes 2d10 Psychic damage

Tail. Melee Weapon Attack: +14 to hit, reach 20 ft., one target. Hit: 17 (2d8 + 8) bludgeoning damage. on a hit the target creature makes a DC 19 con save on failed takes 2d10 Psychic 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 18 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:

Mercury Breath. The dragon exhales liquid Mercury in an 90-foot Cone that is 10 feet wide. Each creature in that line must make a DC 21 Con saving throw, taking 56 (16d6) Psychic damage on a failed save, or half as much damage on a successful one.

Sleep Breath. The dragon exhales sleep gas in a 90-foot cone. Each creature in that area must succeed on a DC 21 Constitution saving throw or fall unconscious for 10 minutes. This effect ends for a creature if the creature takes damage or someone uses an action to wake it.

Prideful Stance. In the reaction Prideful Stance the Cursed Dragon of Pride must see a range melee or range magic attack in order to preform this reaction. The Dragon stands with its pride and  makes a DC dexterity saving throw. if success the attacks do nothing if the succeed they do double the damage.

The Cursed Dragon Pride 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.

Psychic Winds. Pride Extends her wings imbedding it with Psychic energy  and generates a 50ft Cylinder upwards that is 50 ft wide circle. Creatures must make a DC 22 Con save or take 4d10 Psychic damage half damage on a successful on. This attack lasts for 2 minutes. if a creature starts its turn in the area the make a DC 20 con save on failed they take 2d8  Psychic damage half as much on a successful one.

Wing Attack (Costs 2 Actions). The Cursed Dragon of pride beats its wings. Each creature within 15 feet of the dragon must succeed on a DC 23 Dexterity saving throw or take 15 (2d6 + 8) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.