Harpies
They claim to be the archons of Y'baoth. They are known as the eaters of men. The Synod is split on whether the root of their evil is because they have no spirit or because, by eating their cousin, man, they are committing cannibalism. For the harpies, it is the flesh of creation that is needed to birth themselves- shattering of shell, cloud of misama, stain of visera, and screams of agony.
Adding credence to their claims of firstborn versus humans, harpies come in a few varieties, much like the cities of man. Here is an accounting of the commonly seen:
Suadela's Daughters: Beautiful sun-kissed faces, hands for instead of talons, voices soft, clear, a dove-grey plumage, and a yearning song (as Charm Person); each kiss becomes a bite, each bite an alluring apology coated in blood and held with an iron grip.
Bright Throats: Corpse-white feathers halo bloodshot eyes and a brass-toothed maw decorated with the tale-tailed ruby breast; their discordant dirge drives people into rages (all failing a save now act as a berserker)
Lethe Fishers: Smallest common harpies; they have child-like face, a black mask, facial markings and yellow plumpage; shrill, piercing, quick calls that cause people to lose items, lose memories, and lose self-- all swallowed by the malicious grin; the monsters themselves claim the wail of the truly lost seasons the meat in a sticky savoriness
Singers of Nod: Feathers of midnight that end in long electrum-dusted tails, capped in a cowl of black and punctuated by eyes of bright gold; their songs command all to still, to rest, to dream (as sleep)- folks who describe something sitting on their chest as they are falling asleep have these harpies evaluating their flavor
Peasant Makers: A feathers the color of a friar's habit, cowl and talons the color of orange. Their voices are like a wilderness choir that turns swords to plowshares, armor to rust, and horses to go mad; there are tales of them saving villages and towns from approaching armies and then devoured the celebrants
The Praetor: Only one has been recorded and described as a silhouette against the sky as big as the house it alighted on; it seemed to have the sun or moon behind it as a halo; it smile a cruel crescent stretched across its mask-like face as it laid down bizarre pronouncements, edicts, and judgements which the villagers labored to complete least their children be devoured