Contralto Sylph

Dissonance. If the sylph takes damage whilst singing, it's song is disrupted, producing an agonizing discord. The creature that damaged the sylph takes an additional 3 psychic damage from Celestial Song until the beginning of its next turn. If more than one sylph is disrupted, this effect stacks. Damage from Dissonance cannot be reduced in any way save by immunity to psychic damage.

Silence Falls. When the sylph enters an area affected by a Silence spell, or starts its turn there, it is Paralysed until the beginning of its next turn.

Celestial Song. The sylph begins to sing.The sylph can use a bonus action on each of its turns to continue the song.

While the sylph sings, any creature that starts its turn within 300ft of the sylph must make a DC13 Wisdom saving throw, or take 2d4 thunder damage and become frightened until the start of its next turn. On a success, the target takes half as much damage and is not frightened.

Join Chorus. If an allied sylph within 30ft is currently singing, the sylph can instead unite their songs in chorus. For each additional sylph that joins the chorus, (up to a total of five including the original singer), the DC of the Wisdom saving throw increases by 1, and the Celestial Song deals an additional d4 Thunder damage. These effects apply in full to creatures within range of any of the sylphs.

If a sylph is ever more than 30ft from any other member of the chorus, the Joined Chorus ends.

Multiattack. The sylph makes two bow attacks with its Covenant Arc.

Covenant Arc. Ranged Weapon Attack: +8 to hit, range 150/600 ft., one target. Hit: 15 (3d6 + 4) radiant damage.

A chorus of sylphs has one legendary action, which can be used only at the end the turn of a creature not part of the chorus. The chorus regains spent legendary actions on initiative count 20.

If the contralto sylph is part of a chorus, and is currently singing, the chorus gains the following legendary action:

Coda. The contralto sylph sings an echoing, reverberating song that twists time in on itself around an allied creature. One friendly creature who made an attack on the last turn in combat can immediately use its reaction to make one additional weapon attack, or the Multiattack feature if the creature possesses it.