Adult Voidspawn Dragon

Otherworldly Breath. The dragon does not need to eat, sleep, or breath.

Guardian of the Void (1/Day). The dragon can cast guardian of faith, requiring no spell components and using Intelligence as the spellcasting ability.  The spell deals either psychic or necrotic damage (its choice when it casts the spell) instead of radiant damage.

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

Multiattack. The dragon can use its Aura of Madness.  It then makes three attacks: one with its bite and two with its claws.

Aura of Madness. Each creature within 120 ft. of the dragon must make a DC 17 Wisdom saving throw or be frightened by it for 1 minute. A creature can repeat this saving throw at the end of each of their turns.  A creature that fails by 5 or more is frightened of the dragon permanently and rolls on the Long-Term Madness table, exhibiting the effects until the fear ends.  Only a greater restoration spell or similar magic of 5th level or higher can remove these effects.

Bite. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 15 (2d10 + 4) piercing damage plus 3 (1d6) necrotic damage and 3 (1d6) psychic damage.

Claw. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 6 (1d8 + 4) slashing damage.

Tail. Melee Weapon Attack: +9 to hit, reach 15 ft., one target. Hit: 13 (2d8 + 4) bludgeoning damage.

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

Void Breath. The dragon exhales purple and black necrotic energy in a 60-foot line that is 10 feet wide. Each creature in that area must make a DC 17 Dexterity saving throw. On a failed save, the creature takes 24 (6d8) necrotic damage or half as much on a successful one.  Creatures in the area must also make a DC 17 Intelligence saving throw or take 24 (6d8) psychic damage and become stunned until the end of their turn.

Gravitic Breath. The dragon exhales a 60-foot cube of increased gravity. Any flying or levitating creature has its flying speed reduced to 0 and crashes to the ground, taking 5 (1d10) bludgeoning damage per 10 feet fallen. Any creature on the ground must succeed a DC 17 Strength saving throw or take 7 (2d6) force damage and have its movement reduced to 0. Creatures can repeat this saving throw at the end of each of there turns.  The entire area is considered difficult terrain. The dragon cannot use this breath twice in a row. The field lasts until the end of the dragons next turn.

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

1/day each: color spray, hideous laughter, hunger of hadar

Change Shape. The dragon magically transforms into any creature that is Medium or Small, while retaining its game statistics (other than its size). This transformation ends if the dragon is reduced to 0 hit points or uses a bonus action to end it.

Teleport. The dragon magically teleports to an unoccupied space it can see within 60 feet of it.

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.

Claw. The dragon makes one Tail attack.

Void Slip (Costs 2 Actions). The dragon twists the fabric of reality. Each creature within 15 feet of the dragon must succeed on a DC 17 Dexterity saving throw or take 13 (1d6 + 6) force damage and be knocked prone. The dragon can then teleport to an unoccupied space within 60 feet.

Psionics (Costs 2 Actions). The dragon casts a spell or uses its Guardian of the Void ability.