Ilthenvar stands in the Nysanna foothills of the western Northlands, at the height where the tundra grass quits and bare rock takes over. It is a walled town of grey stone built around one structure that matters more than the rest of it put together: a watch-tower whose top room has not gone dark or unmanned in the better part of a thousand years. Travelers coming up the valley at night see the tower-light first, a steady point above the wall, and the star-charts pinned for sale in the gate-market second. They put the two together and call the place the City of Stars. The Velthari, who call it Ilthenvar, "the tally-ground," do not correct them. The wrong name brings the right customers.
The town belongs to the Velthari, the star-accountants whose compact forbids them to worship the lights they catalogue. Their customs, their council, and the two trades they live on are their own article; this is the place those trades are run from.
The tower
The tower is the city. Its top room holds the watch, and the watch never stops. At least one Watcher is at the instruments every hour of every night, and the night's readings go straight into the city ledger in the watcher's own hand. The seven who govern Ilthenvar all earned their seats in that room, and the longest-serving of them, the Head Watcher Sevet, has logged more consecutive nights at the glass than anyone alive. A stranger climbing the tower at dusk would find it less like a temple than like a counting-house that happens to point at the sky: ruled ledgers, cold lamps shaded so they do not foul the view, and a watcher already seated, waiting for the first star to clear the eastern peaks.
Why anyone stays
By every ordinary measure the site is a poor one. Winter never fully lifts from the valley. The white dragon Shananae hunts the peaks directly above, and the Velthari time their movements to her the way everyone in the range does. The nearest settlement that would take them in is days east across open cold. They stay for one fact that holds nowhere else within reach: above Ilthenvar the veil between earth and sky grows thin, the same thinness the Starborn descend to at their high observatories. That thinness pays the Velthari twice from a single patch of sky. It gives the tower a clarity on the celestial glass that no lower station can match, which is why their ground tables are the most exact in the north. And it opens the one clear window up through the band of sky-stones drifting over the Nysanna, which is why their sky-route charts can be drawn at all. Both trades come out of that one window. A warmer site, a safer site, a site clear of the dragon, would cost them both at a stroke. So they pay the cold and the dragon and stay.
The thing under the tower
There is a reason the window is so clear, and the Velthari have buried it.
Beneath the tower, behind a door that opens only when three living council members lay their hands on it at once, is an archive the Velthari have kept for sixty-seven years and never sold. Its records track two titan-glass stars above the valley's longitude, and the pattern they make is not drift. The two are being drawn toward each other, toward a single point of convergence fixed directly over the tower, on a course no unattended object takes and no night of ordinary Starborn tending would produce. Something is moving them, and it means to. The founders' whole doctrine holds that the stars are objects that mean nothing by their motion. These two mean something.
The vault under the tower holds no gold. Three iron rings on the door, set so wide that no one pair of arms can reach all three, and behind it a single shelf: sixty-seven leather ledgers, each a year of the same two columns, the figures creeping a fraction closer down every page. The newest is in the Head Watcher's hand, and it is not yet full.
The worst of it is the part the founders had backward. They built Ilthenvar where the sky was clearest, and the sky is clearest because the convergence is being assembled directly overhead. The thin veil that draws the Starborn and feeds every chart the Velthari sell is the near edge of whatever is being made up there. They came for the best window in the north. The window is a lens, and someone is grinding it, aimed down at the city. Sevet knows the rest. Over the last ten years the two stars have closed faster than across the fifty-seven before them, the figures in the newest ledger tightening from one year to the next. Sevet has logged every night of it and has told no one, not the other six, not the market. The convergence is accelerating, and the only person who has seen the whole shape of it is the one with the most reason to keep the city calm.