What the Crucible does with the cold

The fire under the cloister

Every visitor to Albacan asks the same question sooner or later, usually while stamping the snow off their boots in the archive doorway: why is the cloister roof bare when every other roof in Rem wears a hand's depth of white? The short answer is that the cloister is not standing on rock. It is standing on the Crucible, and the Crucible does not go cold.

Nobody in the archive will tell you more than that over the counter, and this entry will not either. What it can do is describe what a novice sees on the way down, what the night watch writes in its log, and what the heat does to the snow on its way up - which, for a ledger kept at the foot of a tower, is more than enough to fill a page.

A vault that never cools

The stair to the lower levels is lit by torches for the first two hundred steps and by the Crucible itself for the rest. Somewhere past the second landing the stone stops sweating cold and starts sweating warm, and the air takes on the taste of hot iron that every novice learns to recognise long before the catechism.

The vault itself is ribbed like the inside of a whale: iron bands every few paces, bolted where they meet, blackened by soot a finger thick. Along its floor runs a single seam that glows a dull orange at night and a pale gold at noon, when the city above draws hardest on the heat.

It is the only warm room in Rem that nobody wants to sit in.

Overheard in the archive

What follows is the way down, in five plates. The panels are drawn, not photographed - swap in your own pictures and the gallery keeps working exactly the same.

Turris Borealis — where the stair begins

The night watch

The Crucible is watched in shifts, and the watch keeps a log. It is not a literary document. Every hour it records the pressure on three gauges, the colour of the seam, and a single word for the state of the joints: ok, check or call. In the forty years of pages the archive holds, the last word appears twice.

NIGHT WATCH · LOWER LEVEL · GAUGE 03
01:00   pressure 71%   seam amber   joints ok
02:00   pressure 72%   seam amber   joints ok
03:00   pressure 76%   seam gold    joints check
04:00   pressure 73%   seam amber   joints ok
05:00   pressure 72%   seam amber   joints ok

What the watch carries

• A brass lamp that is never lit - the seam gives light enough.
• A pressure key on a chain, for the three relief valves.
• A slate for the log, copied into the ledger at dawn.

At dawn the slate goes up the stair and the numbers go into the ledger, where they sit next to entries about frost on the east windows and the price of lamp oil. Nobody has ever found that neighbourhood strange except visitors.

Cold is what the city is. Heat is what it does.

Why the snow never settles

The heat has to go somewhere. It rises through shafts cut into the cloister walls, warms the stone of the corridors just enough to keep the ink from freezing, and leaves through vents under the eaves in a steady, invisible breath. Snow that lands on the roof lasts about as long as it takes to read this sentence.

From the top of Turris Borealis you can see it for yourself: a city of white roofs, and in the middle of it one dark rectangle, steaming faintly, like a hand held over a cold window. The novices call it the thumbprint. The archive, which does not approve of nicknames, calls it the cloister.

The next entry in this series goes back up the stair, to the gauges, and to the one word in the log that nobody wants to write.