Illron is the southernmost of the three elven kingdoms and the one that has changed least. On the map it is the largest of the three; in practice it is the smallest, because nearly all of it is Iyaklomori Grera, the great uncut forest the fae hold under a treaty older than the confederation itself. The Laeren of Illron live on the edges of their own country, the western coast and a thin eastern margin where settlement meets the trees, and cross the deep interior only by the two routes the fae allow. What the forest is, and what the treaty forbids inside it, belongs to the forest's own entry. What follows is the kingdom that lives around it.
Geography
Illron runs along the Ocean of Elorinia on the west, rises north through the Poscuni Gretanu grasslands toward Amholia Greras and Lenora beyond it, falls away south into the broken country of Wycendeula, and meets the Kelder foothills on the east, where the land begins to climb toward Deo Esari. The interior is one forest. Three rivers cross it: the Kilgre Venora in the north, the Ver Ta'Eres through the center, the Ver Suterela in the south. Any of them could carry a dozen river-towns. None carries one. The forest is the fae's, and the fae do not share it.
Elven Illron is a ring of settlements around the wood's outer rim. Ishla'Anore, the capital, sits on the eastern margin, with E'lethelas south of it along the tree-line. The western coast holds the rest: A'valenor on the northern shore where the Air current comes in, Olymethemar at the center, Hassera at the southern tip, joined to each other by road and to the eastern cities only by the two forest routes or by sea. Lesser woods fringe the kingdom where the great forest thins — Porcuni and Emkoa Greranu on the margins, the Inglingi Eror hills above them. At the center of everything, on the banks of the Ver Ta'Eres, stand the ruins of Kilren's Palace, the place every Illronese child learns to fear before they are told why.
The treaty
The arrangement that defines Illron is not a peace between equals, whatever the later Three Kingdoms Treaty made it sound like alongside the others. It is a license. The Queen of the forest — the being the elves are not permitted to name, who keeps her seat far to the north at Enera Savaci and has never once stood before an elven envoy — permits non-fae to live inside the old wood on conditions she sets through her intermediaries and the elves accept. The prohibitions are few. The deep heart of the wood is closed to them outright. What has never been cut, they may not cut. The water and the ground the song runs through, they may not foul. Keep to that and the edges are theirs, unmolested; break it and the forest answers. The elves call the bargain the fae's tolerance. It reads more like a landlord's terms.
What the Queen claims is not the timber. She claims the song the forest carries — the Faesong pooled thick in old growth that has never been cut, which the elves cannot hear at all and could not work if they could. That is the whole reason the arrangement holds. An elf wants land, wood, clean water, room to build; the Queen wants the current under the trees left running and undisturbed. The two are not after the same thing, so there is room for terms, and Illron has kept its half of them longer than it has kept anything else.
The forest was held to such terms once before, by someone other than elves. Iyaklomori Grera was Caerene ground in the age before the kingdoms, and the trackless wood was the living rite of their patron, Vaerivra, whose whole law is the forest left free and unmarked, answering to no court. When the Queen's terms came down over the wood, the Caerene would not live under them: to accept a sovereign's prohibitions over the trackless forest is to deny the one thing their patron makes the forest be. So they withdrew, east and south to the Green Wilds, and Vaerivra went with the people rather than the ground. The Ythari who keep the forest now never knew her name. This is how a claim on the song displaced a daemon's claim on the conduct of the forest without a war ever being fought — not by defeating Vaerivra, but by binding the wood under terms her rite could not abide, until the rite walked out from under it on its own.
The old ways
Illron votes with Deo Esari and against Lenora on nearly every question of old custom, and at Laeroth Esori, where each kingdom carries one voice regardless of its numbers, the two traditionalist realms outweigh Lenora's four hundred thousand at every turn. The breadbasket resents this, and has lately stopped keeping the resentment quiet. Illron does not bend, because Illron cannot afford to. It produces little the confederation needs, lives on Lenoran grain and confederation standing, and rests its whole existence on one proposition: that elves keep ancient covenants because they are ancient. The fae treaty is such a covenant. So is the confederation. So is every habit of mind that keeps the forest from answering Illron the way it once answered King Kilren.
That is why the present trouble out of Lenora alarms Illron past what the arithmetic warrants. The lesser threat is the secession Myrelin Aelvanor has drafted — Lenora leaving the confederation to buy Deo Esari's titan bone bilaterally, which would strip Illron of its grain and its voting partner in a single stroke. Money Illron can at least argue against. The graver threat has nothing to do with money. Young Lenorans who have seen the Grieving in their walled city downriver have come back unconvinced the contamination is real, and have begun a formal challenge to the exile law on the ground that a four-thousand-year doctrine is myth, and may be set aside once a people stops believing it. To Lenora this is a question of justice. To Illron it is the end of the world by precedent. If an elf can repudiate one ancient covenant because belief in it has lapsed, then nothing guards the fae treaty except belief — and belief, Illron has just been shown, is a thing elves can lose. The forest will not wait for a vote. It waits only for a king to stop believing, and Illron has spent three thousand years making sure none of its kings do.
The elves who live where no elf may
The rule Illron lives by is absolute. No elf settles within Iyaklomori Grera, because the forest does not permit it, and Kilren's Palace is what refusal of permission looks like. The rule has an exception, and the exception lives in the deep wood the rule forbids.
The Ythari are elves — druid-made like all elves, deaf to the song like all elves — and they dwell exactly where no Illronese would set a foot off the path. Each is bound from birth to a single tree, builds nothing, cuts nothing, takes nothing, and dies in the season its tree dies. The fae have never moved against them. A people who would die before a tree of theirs was felled keep the song's law more faithfully than any treaty could compel, so the one kind of elf the covenant should forbid most absolutely is the one kind the forest suffers without terms at all. The Illronese know the Ythari are out there, between the rivers. They do not go looking, and they do not ask the question the Ythari raise simply by existing: whether the wood was ever truly closed to elves, or only to elves who came to take. It is easier to keep a covenant you have decided not to examine. Illron has made that decision, and renews it every generation by declining to make it again.