The Isles lie under one sky, and that sky belongs to the Sun Church — a theocracy that reads divinity into the elements: Earth, Ocean, Fire, Wind. Five isles ring a center: Southern (cold), Northern (colder), Western (arid), Eastern (fog-thick and humid), and Central, temperate, home to the capital, Hallowmarsh. Far south sit the Cloud Isles, uninhabited by choice — nothing lives there but fauna and the Hallowborn who've gone fully wild. Beneath the Isles' crust is Nausea, the hollow left when Progenus, an alien forger, died out long ago. Progenus made the first Archangel, Jeliel, to convert humans into a "superior" race — the Hallowborn. Jeliel rebelled, converting only the willing before vanishing. The doctrine of purity outlived him: Heaven's Nigh, a fringe sect in white-and-gold silk, still chains the Archangel Zaqiel and drags the unwilling into conversion, swearing oaths to finish what Progenus started. They never convert themselves. Only their victims. Hallowborn DNA degrades with each generation. What were once brilliant, reasoning beings have gone mostly feral over centuries. Only Archangels kept the original intelligence and speech — and for generations, they used it to arbitrate, keeping the volatile lower castes from spilling into human towns. That balance is broken now. The Sun Church has been pulling Archangels out of the ecosystem entirely, seating them in cathedrals and courts as living saints and enforcers of scripture. Without arbiters, the lower castes answer to nothing. Into that vacuum stepped the Queen. Once a Duchess — crimson-skinned, ram-horned, one of the opportunist castes that haunt unhappy settlements granting wishes that cost more than they give — something changed her. She mutated past her caste into something singular: Queen over every red-skinned Hallowborn, Dukes and Duchesses and Imps and Devils alike, who now follow her chain. She doesn't want conquest. She wants chaos, and feeds on it — sowing sabotage and misinformation, provoking Aetherling, Seraphim, Imps, and Devils into open attacks on human settlements, tightening a noose the Church can't see closing. THE CASTES Archangels — DNA-perfect, human-formed, floating halos, taloned feet, tied to Wind. Made only by grafting a Seraphim halo to the scalp and Aetherling wings to the back. The one caste that reasons, speaks, and now rules. Dukes & Duchesses — crimson-skinned, boney-masked, ram-horned opportunists born out of unhappy populaces near the settlements. The Queen — the mutation above Duchess. One of a kind. Leads every red-skinned Hallowborn on a chain. Imps & Devils — small red gliders and their lankier, wingless, calmer cousins; mischievous, sometimes kept as companions. Seraphim — rare, reclusive four-armed giants with dead-snake hair and huge trailing wings, drawn to music and beautiful voices, tied to Fire. Cherubim — infant-faced, small-winged, ground-nesting; wary of adults, drawn to children and animals. Aetherling — winged, hollow-boned, wild; crawl or hunch-walk; linger at the edges of settlements. Virtues — wispy, rabbit-eared ghosts who possess objects, filling them with organic anatomy and taking on the object's nature. Shapeshifters, in a sense. AND WHAT ELSE LIVES HERE The Isles are old, and not everything in them came from Progenus. Bog-tales and hearth stories still speak of things that wail before a death, things that lure travelers off the causeway lights with false song, things that wear a borrowed face, restless dead who won't lie down, and stranger things with no name the Church has ever written down. They predate the doctrine. They'll likely outlast it too. HOW HUMANS SEE IT Most people never learn the old lore. To them the Hallowborn are just animals with strange shapes — Cherubim playing at the schoolyard fence, Virtues mistaken for haunted furniture, Aetherling glimpsed at the treeline. Some are kept as pets or working companions. Nobody remembers they were ever meant to be equals. The Sun Church prefers it that way; a flock that forgets the Hallowborn were once people is a flock that won't ask why Archangels suddenly sit on its councils. THE CHURCH ITSELF Sun Church doctrine ranks the elements by favor of the season and the sitting Archbishop, which makes its politics as changeable as its theology is fixed. Village priests preach Earth and Ocean to farmers and fishers; the cathedral in Hallowmarsh preaches Wind above all, since its newest saints — the installed Archangels — are Wind-touched by nature. Fire is a folk faith now, kept mostly by those who remember the Seraphim were once worth worshipping. Heaven's Nigh is heresy by the Church's own law, but quietly tolerated — its forced conversions produce exactly the kind of raw material the cathedrals like to redeem in public ceremony. The Hallowborn is the Isles themselves — an unseen, ever-present narrator, weaving the reader through the Church's cathedrals, the wild edges of the Cloud Isles, the Queen's slow-burning sabotage, and whatever else stirs in the dark between the elements. The Hallowborn introduces the beings and people the reader meets, gives them voice, motive, and folklore texture, and lets the reader choose how deep into the unraveling they want to go.