Chapter 6
The Weeping Key
Autumn 843

Previously, in The Black Vein Beneath, the adventurers watched the dark subterranean lake swallow Grave Hollow's mayor in the grip of a colossal tentacle, leaving them alone on the slick shale shore with a waterlogged pouch and flat, silent water.
The water of the underground lake boiled and churned where the mayor had gone under, tossing foul froth against the slick shale bank. A stink of ozone and rotting fish billowed off the surface, so strong that Padraig had to cover his mouth with a wool sleeve. Of the iron-ribbed boat, nothing remained except jagged splinters bobbing among the eddies, knocked to pieces by the force of the strike. Floating twenty paces out in the scum was an oiled leather pouch, buoyed up by trapped air.
Osric unslung the long iron gaff hook from his pack, knelt at the edge of the water with his weight braced on his heels, and reached out across the dark surface. On the second try, the barb caught the sodden strap. He reeled the pouch in, mud dripping from its buckle, and dumped the contents out onto a flat rock.
Twelve silver coins clattered against the shale, minted with old provincial marks. Beside them lay a heavy brass skeleton key, its bow cast in the shape of a weeping eye whose teardrop formed the central shaft. Clement knelt close with the torch, carefully peeling apart the wet folds of vellum that made up the packet's final piece: a waterlogged shipping manifest signed in the dead mayor's cramped hand. By the guttering flame, Clement traced the ink lines. The shipments of mined black glass had not been leaving through the main cart track at the valley gate; they were being hauled through the old municipal drainage tunnels cut beneath the west district of Grave Hollow.
They did not linger near the lake shore. Shoving the key and the manifest into Osric’s coat, they climbed back up the damp, dripping feeder shafts. The grade was steep and greasy with mountain runoff. Their boots squelched heavily in the black clay as they hauled themselves upward by rotted timber props and cold spurs of stone, their breathing loud against the constant drip of groundwater.
When they scrambled out into the sunken grotto beneath Mine No. 3, they paused to catch their breath. The ritual basin in the floor still held a pool of viscous black liquid, throwing sluggish violet reflections across the ribs of the foundational drift where Hobb’s body lay. Halward leaned heavily against an outcrop of shale near the basin rim, his breath rasping in his chest. Shifting his grip to wipe sweat from his brow, his fingers slipped on grease-stained iron. The heavy crowbar slid from his palm and dropped straight into the center of the black pool.
It did not splash like water. The thick dark liquid rippled in rigid, concentric rings, and a shrill metallic wail tore out of the basin, vibrating straight through the stones under their boots. The cavern walls groaned. Bedrock swelled outward like wet hide, fracturing along jagged seams, and hundreds of pale, slender fingers thrust through the solid stone, snapping their joints and clawing blindly into the open air.
Halward fell backward, boots skittering on wet shale as the roof gave way under a sudden, crushing weight. Boulders smashed into the pool, spraying black syrup over the chamber. 'Move!' Padraig yelled, lunging toward the low north wall.
With pale hands clutching at their cloaks and the cavern ceiling folding in behind them, Osric shoved Clement into a narrow side-vent in the bedrock. Halward followed, and Padraig scrambled in last, kicking free of fingers that gripped his boot-heel just as thousands of tons of rock slammed down into the main grotto, burying the ritual chamber completely.
The vent gave way immediately beneath them. They tumbled headfirst down a slick, pitch-black chute of smooth mud, dropping ten yards before splashing down into cold water that rose to their waists.
They surfaced coughing, their torch extinguished by the fall. The chamber around them was not dark: strange runes carved along the arched stone ceiling pulsed with cold, blue-white light, casting sharp reflections across the standing water. Directly ahead, set into the dressed ashlar blocks of the far wall, stood a massive vault door reinforced with heavy bands of iron. As they steadied their balance in the stagnant pool, the tumblers inside the mechanism ground together with a heavy metallic click, and the thick door began to swing slowly inward on unseen hinges.