Quench and Crack

Raw volcanic glass hates an unsteady hand.

I sat over the floor-flue with my knees pressed against the leather apron, holding a fist-sized core of black pitchstone between my thumb and forefinger. Down in the vent trench, cherry-red gas hissed through the iron grate, bathing the workshop in sulfurous warmth. All I wanted was three quiet bells to finish knapping this matched pair, pocket three thick copper rings before Yamato gambled them away, and buy half a basket of dried tubers from the market stall before nightfall. Outside our crater walls, three hundred leagues of white frost had crushed the world into silence, but here on the Third Terrace of Oshuro, sweat ran down the bridge of my nose and dripped onto my anvil block.

I adjusted the bone billet. The angle had to be forty-five degrees. Exactly forty-five. If the strike was too steep, the shock shattered the conchoidal grain into useless powder. If it was too shallow, the edge came away dull, incapable of trapping the vent's thermal soak.

I brought the billet down with a dry snap of the wrist.

A razor-thin flake peeled away, ringing like a struck bell. The newly exposed facet caught the furnace-glow from the floor grating, shifting from dull charcoal to an oily, shimmering violet. Deep inside the stone, the heat found its path, locking into the crystalline grid. Clean, pure, and ready to hold fire.

"Still tapping rocks while the world freezes?"

The voice was rough enough to scrape hide. Yamato ducked his massive shoulders under my lintel, his broad frame blocking the dim dusk light filtering from the alleyway. He wore a boiled-leather vest patched with wire, and his knuckles were thick with scar tissue from five seasons in the lower fighting pits.

"I am finishing the blades you only paid half a deposit on," I said without glancing up. "Which means you can stand outside until the soak settles, or you can take raw, brittle glass, swing it in the pit, and slice your own thumbs off."

"The match starts at red bell," Yamato grunted, stomping his heavy boots onto my stone floor. He tracked red terrace mud across the threshold. "Kura brought two fighters up from the Fourth Terrace. Big bastards with iron-capped clubs. If I step into the ring with bare fists, they will beat my ribs into meal."

"Then you should have planned three days ahead instead of yesterday dusk," I told him. "Poor planning on your part does not make me strike stone faster."

I lifted the second blade from the vent-rack using iron tongs. The glass was so hot the surrounding air warped in shimmering ribbons. I laid it beside its twin on the cooling slab, checking the spine for hairline flaws. A single microscopic crack would vent the absorbed thermal energy in a useless puff of steam the moment the edges met.

"Are they ready or not, Tadashi?" Yamato leaned over my low workbench, his sour breath reeking of fermented mash. He reached out a thick, calloused paw toward the hilts.

I slapped his wrist with the flat of my copper scraper. "Touch them before the temper sets and you will leave your skin behind."

Yamato pulled his hand back, scowling, but he did not strike. Even pit champions knew better than to pick a fight with the man who ground their edge.

"Three copper rings," I said, holding out my open palm. "The heavy minting from the flue-bailiffs. Not the shaved trash Yamato usually tries to pass off after losing a wager."

He cursed under his breath, rummaging through a greasy pouch at his belt. With a heavy grimace, he slapped three solid, unclipped copper tokens into my calloused hand. I checked each one: thick ridges, proper weight, no lead core. I dropped them into the tin lockbox beneath my stool, the metallic clatter confirming the gain. Three days of food and clean vent-tax, secured.

"Now pay attention," I told him, making my decision. "Because if you misuse these, I am not replacing them when you run crying back from the ring."

I picked up the pair of daggers by their cord-wrapped hafts. The obsidian was mirror-black, ground to a sheer bevel along the inner flats. I held them before his face and brought the twin edges together in a sharp, deliberate forty-five-degree cross-strike.

Clink.

A sheet of superheated air erupted along the contact line. A humming, hair-thin plane of orange radiance flared between the blades, shearing three inches through the dry cedar cutting post beside my bench before vanishing back into the glass. The severed wood tumbled to the floor, its cut face glowing like a live coal.

Yamato let out a low whistle, his small eyes widening with greedy delight. "Now that will open a man from throat to belt."

"It will give you three clean strikes," I warned, wrapping the weapons in dry, oiled pelt before passing the bundle into his hands. "Four if you do not drag the edge against bone. And keep them dry."

"Dry?" Yamato scoffed, tucking the bundle under his arm. "It is blood, Tadashi. Rings get wet."

"Warm blood is fine. Cold moisture kills the soak instantly," I said, holding his gaze. "One drop of melting snow or icy water on that seam, and the heat drains into nothing. You will be left holding two expensive pieces of brittle gravel. Do you understand?"

"Yeah, yeah. Do not drop them in a puddle." He turned toward the door, eager to show off his new iron-cutters to whatever pack of ruffians was waiting at the ring. "You should come down to the pits tonight. See what your glass does to Kura's boys."

"I have two more orders to flute before the steam-bells ring," I said. "And watching men bleed for pennies is a poor use of good oil."

"You have no joy in you, toolmaker." Yamato grinned, exposing a row of chipped teeth. "Just rocks and ash."

He had barely cleared the threshold when the mountain shuddered.

It was not the familiar, rhythmic rumble of the deep magma flues venting their pressure. This was a jagged, tearing crack that vibrated straight through the basalt floorboards, rattling the tongs on my rack and knocking a row of pre-forms off the shelf.

Dust rained down from the ceiling rafters. Outside in the alley, shouting erupted—sharp, panicked voices cutting through the evening gloom.

"What did you do to your stove?" Yamato braced himself against the doorframe, his grin vanishing.

"That was not the stove," I said, rising from my stool.

A deafening roar split the sky above us, followed by the terrible, screeching sound of shattering rock. High up on the northern rim—where the great basalt ramparts held back the frozen wastes—a plume of gray dust and white vapor bloomed into the twilight. Huge slabs of rim-stone, crusted in millennia of blue glacier ice, broke loose and plunged into the crater.

They crashed into the Upper Terrace with the force of falling stars. The shockwave reached us a heartbeat later, blowing a blast of freezing mist down the alleys and snuffing the gas lanterns along the thoroughfare.

The dry, sulfurous heat of my workshop suddenly plummeted. Frost instantly rimed the edges of my open vent.

Yamato stared up at the collapsing rim, his face pale under the soot. "The defenses... the northern wall is gone."

I looked down at the vent-rack. In the sudden draft of arctic air, the faint violet glow inside my remaining obsidian cores flickered, sputtered, and died.