Adult Skywing

Animus, there is a 1 percent chance that the Skywing is an animus. An animus Skywing has a challenge rating of 30 and can cast the wish spell at will. There is a 1 percent chance that an animus has crazed itself by using its magic too much. A crazed Skywing's alignment changes to chaotic evil and it attacks recklessly. An animus Skywing can become crazed during battle. one option is to keep animus points. at the beginning of combat the Skywing has 25 (4d10+10) animus points. every time it uses its magic, it loses one animus point. If it loses all its animus points it becomes crazed. the same feature can be added to a crazed Skywing, except when the Skywing loses all of its animus points, it dies.

Claw Melee Weapon Attack: +7 to hit, reach 10 ft., 1 target. Hit: 40 (7d10 + 10) slashing damage. 

Bite Melee Weapon Attack: +5 to hit, reach 10 ft., 1 target. hit: 60 (9d10+20) piercing damage, and if the dragon chooses: the target is grappled if it is medium or smaller.

Tail Melee Weapon Attack: +4 to hit, reach 15 ft., 1 target. hit: 30 (2d10+10) bludgeoning damage. If the target is a creature that is huge or smaller, the creature must make a dexterity saving throw or be knocked prone.

Frightful Presence. Each creature of the Skywing's choice that is within 120 feet of the Skywing and aware of it must succeed on a DC 19 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.

Fire Breath The Skywing exhales fire in a 100-foot cone. Each creature in that area must make a DC 21 Dexterity saving throw, taking 95 (19d10) fire damage on a failed save, or half as much damage on a successful one.