Deathcall Harpy

Magic Resistance.
The Deathcall Harpy has advantage on saving throws against spells and other magical effects.

Desolation Chorus.
While more than one Deathcall Harpy uses or is concentrating on Desolation Melody, affected creatures have disadvantage on Wisdom saving throws to resist the melody.

Multiattack. The harpy makes two Rend attacks.

Rend. Melee Attack Roll: +5, reach 5 ft. Hit: 10 (2d6 + 3) Slashing damage and 3 (1d6) Necrotic damage.

Desolation Melody (Recharge 5-6). The harpy sings a magical melody, which lasts until its Concentration ends on it. Wisdom Saving Throw: DC 14, each Humanoid and Giant in a 300-foot Emanation originating from the harpy when the song starts (demons succeed automatically). Failure: The target is compelled by despair. They have the Charmed condition until the song ends and repeats the save at the end of each of its turns. While Charmed, the target has the Incapacitated condition and seeks to harm themselves by using their movement to move towards hazards such as fire, cliffs, pits, or similar. If none are nearby, they move towards the harpy. However, before moving into damaging terrain and whenever it takes damage, the target repeats the save with disadvantage.

Fiendish Flight.
She can take the Dash or Disengage action as a bonus action while flying.

Deathcall (1/day).
When the Deathcall Harpy takes damage from a creature it can sense within 60 feet, it unleashes a burst of necrotic energy. The creature must make a DC 14 Constitution saving throw, taking 14 (3d8) necrotic damage on a failed save, or half as much on a success.