The archway swallowed them whole.
Kallum stumbled forward into darkness and Elyria followed, the lumen-stone at her belt casting a pale sphere that revealed walls stretching into infinity. Obsidian everywhere-polished to mirror-perfect darkness, curved and seamless, a cylinder of stone that rose hundreds of feet overhead.
His reflection looked back from every surface. A thousand Kallums, a thousand Elyrias, repeated into the dark.
"Keep walking," Elyria said. Her voice was tight. "Don't stop for anything."
The floor was the same black glass, and beneath it-bodies. Hundreds of them suspended in the stone like insects in amber, Kynish warriors in rusted armor and human forms in Order-robes, all the dead the Throne had claimed over centuries.
Kallum forced his eyes up.
The obsidian rippled.
The reflections changed.
The Kallum in the mirrors wore Knight's armor, Order-steel polished to mirror brightness. The Elyria beside him wore the white robes of a Resonance Physicist, her expression cold with analytical detachment.
"They're alternatives," Elyria said. "Versions of us who made different choices."
More appeared. Purifier-Kallum, eyes emptied of doubt. Corpse-Kallum, burned black and still. A version of Elyria on a dissection table, her chest opened to organs the color of bruised stone.
The mirror-Kallums turned toward him.
"Let me in," the Knight said. "I know what you are. I know how to fix it."
"Let me in," the Purifier said. "I know how to end it."
"Let me in," the corpse said. "I know how to be still."
The silver and gold in Kallum's arm pulled upward. The Dirge wanted their certainty. It wanted answers.
His left hand moved without permission.
"Kallum!" Elyria grabbed his wrist, hauled him back.
The obsidian cracked.
Hairline fractures spread through the polished stone like frost. The mirror-versions distorted, then shattered.
"Run!" Elyria dragged him toward the far archway. "This place-it's a gauntlet. All of them, one after another-"
They scrambled through the archway as the floor collapsed behind them.
Kallum hit the ground rolling and came up in a chamber that looked like liquid. Pale stone walls rippled like water, the floor shifting underfoot like sand, the ceiling dripping light in thick pooling patches.
A figure stood at the far end.
Solen.
The figure stood taller than Solen should be, the face empty of warmth, the eyes burning with absolute certainty.
"You came to kill me," the Solen-thing said. "That's all you are now. Vengeance given form."
Kallum's knife was in his hand before he knew he'd drawn it.
The chamber moved with him, stone rippling under his boots, walls curving inward to help him close the distance. The knife trembled a breath from the Solen-thing's throat.
"Then kill me," it said. "I'm exactly what you need. Something to hate. Something to kill."
"Kallum." Elyria's voice cut through the red haze. "This place is using you. It's showing you what you believe."
"He needs to die."
"Maybe." Her voice caught on something-grief, or recognition. "But who are you when he's gone? What's left of Kallum Vire when he runs out of things to hate?"
Kallum lowered the knife.
The Solen-thing smiled.
The Solen-thing smiled. "Refusing me changes nothing.""
The manifestation dissolved. The chamber walls rippled like water, pale stone flowing into a new configuration-liquid and shifting, the floor dropping away beneath them.
Kallum scrambled back, pulling Elyria with him as the stone reformed beneath their boots. The liquid walls hardened into translucent crystal, and the floor revealed rows of bodies frozen inside.
Dozens of them, hundreds-all his face, all his body, each in a different state of transformation. Some human, the silver and gold just beginning. Some halfway changed, the transformed flesh creeping toward shoulders. Some fully transformed, bodies of ochre crystal and silver-gold spirals, faces geometric approximations of features.
All dead.
"The Third Echo," Elyria said. "The test of Self."
Kallum's breath caught.
One of the bodies moved.
The fully transformed one-crystalline flesh, ochre light, facets where eyes should be-stepped out of the stone and moved toward him with inhuman grace.
"You're frightened," the thing said. Its voice was Kallum's voice, layered over itself like chords. "You're frightened of becoming me."
"You're what the Throne made to scare me."
"What you already are, just further along." The crystal-body tilted its head. "How much more until you're me?"
Kallum didn't have an answer.
"The Third Echo strips away identity. It shows you what's left when the self is gone."
"What's left?"
"You'll see."
The crystalline Kallum moved toward them.
"The Vestige keeps her. The shard in your satchel-it's eating everything she is except the feeling. I'm what happens when the feelings are gone. I'm the judgment, purified. Just the song."
Kallum waited for Shea's voice.
Nothing.
The frequency was silent.
"This place tries to decide you," Elyria said. "It's showing you your endpoint and asking if that's who you want to be."
"Who are you when she's gone?" the crystalline thing asked. "When the Vestige finishes eating her memory, when the love is all that's left, and then that's gone too-who are you?"
Kallum looked at his left arm.
The silver and gold pulsed. He could feel them pressing against his throat when he swallowed, pulling upward with every breath.
He didn't have an answer.
"I don't have to decide yet."
"The markings are close. The Cascade begins in hours. What will you choose when it starts?"
"Choose?"
"Fight it and the transformation tears you apart. Accept it and you become me. Die. The Dirge doesn't accept the Cascade. It fights. The fighting destroys you."
Kallum thought of the bodies around the chamber. Dozens of Kallums, all dead, all frozen in stone like exhibits.
They'd all fought. They'd all lost.
Something brushed against his mind-a whisper, a suggestion of sound.
*"Kallum."*
His heart seized.
The whisper was there and gone, fleeting as smoke, and he couldn't tell if it was Shea or the Vestige mimicking what he needed to hear.
The crystalline Kallum's facets brightened.
"The Vestige learns what you need and becomes it. It knows you want her to be real, so it gives you her voice, her love, her presence. It's eating her, Kallum. Every time you reach for her, every time you listen, you're feeding the Vestige the last pieces of who she was."
Kallum's hands shook.
"Kallum." Elyria's voice was weak. "We have to move. The Echoes are connected. If we stay too long, they decide us."
Kallum looked at the crystalline Kallum one last time.
The thing stood in the center of the chamber, its facets pulsing with warm ochre glow. Beautiful. Perfect. Everything his power had been pushing him toward.
And it wasn't him.
"I refuse to become you."
"We always see, in the end."
The walls began to crack.
Hairline fractures spreading through the crystal like frost. The bodies inside shifted, their frozen forms pressing against the stone like they were trying to break through.
"The gauntlet is ending," Elyria said. She grabbed his arm, pulling him toward the far archway. "Either we pass or we die here."
Kallum let her pull him forward.
The crystal-Kallum watched them go, its ochre facets burning with patient hunger.
"Who are you when she's gone?" it called after them. "Who are you when the song is all that's left?"
They scrambled through the archway as the Hall of Echoes collapsed behind them.
The sound was enormous-crystal shattering, stone falling, the violet-gold light within the walls flaring bright before winking out.
Then silence.
Dust rolled through the archway, coating them in fine grey powder.
Kallum pushed himself up, coughing. His left hand trembled at his side, the fingers curling inward without his permission.
"Kallum?" Elyria was already sitting up, brushing dust from her cloak. "Are you hurt?"
"My hand." He stared at it. The fingers spasmed, then straightened. "It's getting worse."
"The Cascade." She pressed the back of her hand to her nose, and when she lowered it, blood smeared her upper lip. "We're running out of time."
She tried to stand and stumbled, catching herself against the wall. Her hands shook so badly she couldn't keep her grip on the knife. The crystal's resonance had burned through her-exhaustion deep in the bone, nerves frayed to the breaking point.
"Elyria-"
"I'm fine." She straightened, but her face was paper-white. "We have to keep moving. Solen is-"
She broke off.
The corridor ahead was different. Pale translucent walls, and they bore marks-fresh cuts, deep grooves in the crystal, destruction that couldn't have been more than hours old.
Kallum knelt, running his fingers along the gouges.
The crystal was still warm.
"Someone came through here," he said. "Recently."
He stood and followed the path of destruction. The crystal walls bore witness to passage-a trail of shattered faces, crushed expressions, the mountain itself torn apart by something that moved through it like a storm.
Fifty yards in, the corridor opened into a small antechamber.
Kallum stopped.
Elyria made a sound-half gasp, half sob.
A Stone-Singer lay shattered across the floor. Its crystalline form was obliterated, shards scattered like broken glass. The song that had animated it was gone, ripped out of the mountain's resonance.
Kallum touched a shard.
Still warm.
"Order resonance," he said. "The power they've been refining for centuries-the ability to impose their will on reality."
Elyria's face had gone pale.
"Solen."
"He came through here." Kallum's voice was flat. "He tore this mountain open like it was nothing. He killed anything that tried to stop him."
He looked at the gouges in the floor, the shattered walls, the trail of destruction leading forward.
"Couple of hours ago," he said. "Maybe less."
Elyria's breath caught.
"He's ahead of us."
Kallum nodded.
"He's close. Too close."
The mountain had chosen. And it had chosen Solen.
"We have to move," Kallum said. "If he reaches the Throne before us-"
"We can't let that happen." Elyria's voice was grim. "We can't let him get that kind of power."
"He already has it." Kallum looked at his transformed arm, the silver and gold spirals pulsing with ochre light, the cold certainty spreading toward his throat. "The question is what he'll do with it."
They moved into the corridor of faces, and Kallum's vision blurred at the edges-rainbow fringes around everything he looked at, like light seen through flawed glass.
The Cascade was changing everything he perceived.
When he tried to speak, the sound was wrong. Words cracked, splintering into harmonics that buzzed like insect wings.
"The Cascade has started," Elyria said. Her eyes were wide with horror.
"I know." The harmonics made the words strange, layered with frequencies he didn't recognize.
"We have hours," she said. "Maybe less."
"Then we run."
They ran.
The Hall of Echoes vanished behind them.
But the real nightmare was ahead.
The Vestige pulled toward the darkness with hunger, with recognition, with something that had waited three thousand years for this moment.
The Throne waited.
And somewhere ahead, chanting in the language of the Order, walked Father Solen.
Kallum's left hand twitched at his side, curling into a claw.
His voice, when he tried to speak, came out layered with harmonics that weren't his own.
The Cascade had begun.
He didn't know how much time he had left.
He only knew that ahead lay the Throne-and Solen-and that one of them would be the last thing he ever saw.