Multiattack

The dragon attacks once with its bite and twice with its claws. In place of its bite it can use Psionic Wave.

Bite

Melee Weapon Attack: +12 to hit, reach 10 ft., one target. Hit: 22 (3d10 + 6) piercing damage plus 4 (1d8) psychic damage.

Claws

Melee Weapon Attack: +12 to hit, reach 5 ft., one target. Hit: 19 (3d8 + 6) slashing damage.

Psionic Wave

The dragon psionically emits a wave of crushing mental pressure. Each creature within 20 feet makes a DC 18 Wisdom saving throw taking 16 (3d10) psychic damage on a failed save or half damage on a success. Creatures suffering ongoing psychic damage make this saving throw with disadvantage.

Discognitive Breath (Recharge 5-6)

The dragon unleashes psychic energy in a 60-foot cone. Each creature in that area makes a DC 18 Intelligence saving throw taking 60 (11d10) psychic damage and 11 (2d10) ongoing psychic damage on a failed save or half as much psychic damage and no ongoing psychic damage on a success. The ongoing damage ends if a creature falls unconscious. A creature can also use an action to ground itself in reality ending the ongoing damage.

Prognosticate (3/Day)

The dragon psionically makes a prediction of an event up to 100 years in the future. This prediction has a 67 percent chance of being perfectly accurate and a 33 percent chance of being partially or wholly wrong. Alternatively the dragon can choose to gain truesight to a range of 90 feet for 1 minute.