The path to the furnace was a descent into madness. The molten rivers that had laced the tunnels behind them all converged here into a single roaring chasm, a sea of liquid fire boiling beneath a cathedral of black iron and stone. The heat was suffocating and alive, pressing against their lungs like invisible hands. Every breath tasted of smoke and rust.
They stood at the edge of the Heart Furnace, the beating core of the second level — a monstrous construct older than memory, where machine and magma had fused into one. Pistons the size of towers rose and fell in a slow rhythm and slammed down into the molten pool with earth-shaking force. Every impact sent up plumes of vapor that curled into shapes that almost looked like faces, screaming and whispering and pleading. The structure was a labyrinth inside the Labyrinth. Iron bridges crossed above the lava, leading to furnaces shaped like the ribcage of a dying god, and chains as thick as tree trunks hung from the ceiling with cages dangling from them, full of prisoners who glowed faintly in the heat. Some of them were still alive. Others had become statues of ash, frozen in the middle of a scream. At the very center rose the Core Engine, a black metal tower that pulsed like a heart, covered in glowing sigils that shifted and twisted when anyone looked at them directly. Every few seconds it exhaled a burst of molten vapor, and from somewhere deep inside it came a heartbeat — slow, rhythmic, ancient. Tarko had called it the beast that feeds the Labyrinth.
Magma veins crawled up the walls and into the machine through metal arteries that throbbed with red light. Around the base of the Core Engine stood a dozen Seers — tall, hooded figures with faces hidden behind masks of obsidian glass, who did not walk so much as glide, their robes dragging through the molten dust without ever catching fire. Their presence bent the air around them, and whenever they turned their heads, the metal nearby groaned.
"This place," Mahin whispered, with sweat pouring down his face, "it's alive."
Oscar nodded. "And it's watching us."
Somewhere behind the Core Engine, a shadow moved — slow and deliberate, wrapped in tattered black. Every eye was drawn to it at once. The Fallen One was there, chained to a support beam at the very base of the furnace.
The three of them crouched on a ledge high above the chaos with the heat making the air ripple around them, and below them dozens of Seers patrolled the lower platforms with their masks glowing a faint, eerie red. To reach the Emperor, they would have to get past every one of them.
Oscar leaned close to Tarko. "You said that if they catch someone without a pass, they send him to the fourth level, right?"
Tarko nodded slowly. "Aye, that's the rule."
"Then there's only one thing left to do. You're going to go and get the Emperor."
Tarko blinked at him. "There's a problem with that plan."
"What problem?"
The old man scratched his head awkwardly. "I don't have a pass."
Oscar and Mahin both stared at him.
"What do you mean, you don't have a pass?" Oscar hissed. "You just told us no one can mine here without one!"
"Well, I lied," Tarko said with a shrug. "It's a trick we play on the newcomers. Gets them to cough up a few things. The only place you really need a pass is here, at the furnace."
Oscar rubbed his face. "Brilliant. So what are we supposed to do now?"
Mahin set his jaw. "I'll draw the Seers off. You two get His Highness out."
"You're unarmed," Oscar said. "If they catch you, they'll send you down to the fourth."
"It doesn't matter. It's only the fourth."
Tarko turned on him sharply. "You don't understand. The fourth level is where the Beast sleeps. Nobody who strays from the path to the fifth ever comes back. And if the Seers take you, they won't put you on the path." His voice dropped. "They'll send you into the forest."
Mahin hesitated, and his courage faltered. His Emperor was only a few meters away, chained beside the glowing heart of the furnace, close enough that he could almost reach out and touch him — but not without dying for it.
"I think I have a better idea," Oscar said into the silence. He crouched and traced a line in the ash at his feet. "The furnace runs on these magma veins, and they aren't only for heat. Look at the Seers. That glow around them isn't magic, it's power, and it's coming from the veins. If we cut one, even for a moment, they'll go blind."
Mahin's eyes widened. "You mean cut them off from the Labyrinth?"
"Exactly. A short blackout, just long enough to grab Kaiser and get out before the furnace restarts." He looked up, and the magma glow was reflected in his eyes. "Tarko, you know these tunnels better than anyone. There has to be an access vent somewhere — something that runs underneath the core."
The old prisoner hesitated. "There is. But it's suicide. The pressure down there can melt a man alive."
"Then we move fast. You take me to it. Mahin, when the lights die, you go for the Emperor. No noise and no hesitation. Get him free and meet us at the catwalk on the north side, and we head for the third level before the Seers can see again."
Tarko looked at him for a long moment with thirty years in his stare. "You're mad," he said at last. "But maybe madness is exactly what this place needs."
Oscar's smirk hardened into resolve. "Then let's give the Labyrinth something to remember."
The tunnels beneath the main chamber were narrow and blistering hot. Veins of magma ran through translucent pipes in their walls like glowing arteries, while every few meters the ground shook to the rhythm of the Core Engine above them. Tarko led the way, limping but quick, muttering curses as he went. "This way. Stay close, and don't breathe too deep. The air down here can boil your lungs."
Oscar followed with sweat streaking his face and every breath a struggle in the dim, flickering red light. "Where's the vent?"
Tarko pointed to a circular hatch of thick, rust-rimmed iron at the end of the corridor, cracked by the heat. "That's it. The control vein runs right under there. Break it, and the Seers go blind for about twenty seconds. Maybe less."
"Twenty seconds is all we need." Oscar turned to him. "Once it starts, you get clear. No heroics."
The old man snorted. "I stopped being a hero thirty years ago. But I'll see it through."
They pried the hatch open. A rush of red steam burst out and scalded their faces. Inside, the pipe glowed with molten light, energy pulsing through it like a living thing, and Oscar gripped his claw tool as its metal began to bend in the heat. "Ready?"
"Do it fast," Tarko said.
Oscar drove the tool down into the glowing vein. There was a deafening shriek of tearing metal, a flash of white light. The whole chamber above them shuddered. The furnace's heartbeat faltered. The molten glow in the air dimmed, and then there was silence.
Mahin had been waiting for exactly that moment. The instant the world went dark, he ran. The bridges stopped glowing, and the Seers' obsidian masks flickered in confusion, their connection to the Core cut for the first time in living memory. Through the smoke, he found him: Kaiser the First, chained to a support beam at the base of the furnace, his cloak scorched and his face half hidden, but with those eyes still burning in defiance.
"Your Majesty!" Mahin hissed, and he hacked at the chains with a heated claw tool until the metal snapped in a shower of sparks. Kaiser looked up at him, weak but conscious. Mahin pulled the old man's arm across his shoulders and hauled him to his feet. "We're getting you out!"
Around them, the Seers had begun to stir, their heads twitching as a faint red light crept back into their masks. The blackout was ending. From somewhere below, the furnace let out a roar as the Core reignited, and Mahin gritted his teeth. "Move!"
They ran across the bridge as the lava veins lit up again one after another, like the eyes of something waking from sleep. Behind them the Seers began to scream in distorted, inhuman voices, and chains lashed out across the platforms like striking serpents. Oscar and Tarko burst out of a side tunnel, covered in ash and sweat, with the blown vent door smoking behind them. "Go!" Oscar shouted. "They can see again!"
They sprinted together, ducking under collapsing beams while molten debris rained down around them, and Tarko led them to a spiral shaft carved into the stone wall — an old maintenance route the miners had used long ago. "This way! It leads to the descent!"
They climbed as fast as they could while the furnace roared below them like a beast cheated out of its prey. One Seer's scream rose sharp and hollow, a sound that seemed to cut straight through solid rock. Then they reached the top of the shaft, and a gust of cool air struck their faces for the first time in what felt like an eternity. Ahead of them, a dark tunnel sloped downward, marked with faint symbols of blue light, toward the third level.