Multiattack

The dragon uses Grasp of Shadows then attacks once with its bite and twice with its claws.

Bite

Melee Weapon Attack: +15 to hit, reach 15 ft., one target. Hit: 30 (4d10 + 8) piercing damage plus 9 (2d8) necrotic damage.

Claws

Melee Weapon Attack: +15 to hit, reach 10 ft., one target. Hit: 21 (3d8 + 8) slashing damage plus 9 (2d8) necrotic damage.

Grasp of Shadows

The dragon targets a creature within 60 feet forcing it to make a DC 18 Dexterity saving throw. On a failure it is grappled by tendrils of shadow (escape DC 23) and restrained while grappled this way. The effect ends if the dragon is incapacitated or uses this ability again.

Anguished Breath (Recharge 5-6)

The dragon exhales a shadowy maelstrom of anguish in a 90-foot cone. Each creature in that area makes a DC 23 Wisdom saving throw taking 81 (18d8) necrotic damage and gaining a level of strife on a failed save or half damage on a success.