Sunlight Sensitivity. While in sunlight, Ontharyx has disadvantage on attack rolls.
Multiattack. Ontharyx makes two Unarmed Strike or Nightmare Blast attacks.
Unarmed Strike. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit:7 (1d6 + 4) bludgeoning damage plus 10 (3d6) psychic damage.
Nightmare Blast. Ranged Weapon Attack: +6 to hit, range 60 ft., one creature. Hit:7 (2d6) psychic damage, and the target must succeed on a DC 12 Wisdom saving throw or have the frightened condition until the start of Ontharyx's next turn.
Defensive Flight. Immediately after taking damage, Ontharyx flies up to its speed. This movement doesn't provoke opportunity attacks.