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Cinder put one foot in front of the other, straight at the place that had broken her. Slow. Her orange eyes burned brighter than the drifting ember moats around her.

The cat rode her shoulder the whole way.

At the edge of the frost, her step faltered.

The cat pushed its head up under her jaw and held it there.

She took the next step.

She reached the line and stood in it. Half in gold. Half in grey.

Then she pushed.

Heat rolled off her white-hot patches into the cold.

The line on the floor stopped moving. Then the frost retreated a finger’s width. Then two.

"There." Beside the cold room, the young handler straightened, puzzled rather than afraid. "You feel that? It’s getting warmer."

The old one looked up. Then returned to the wrappings around the Ice Heart. "Ay. Now work."

"Now," Aiden said, and drove his knife into the fruit.

Liquid fire welled up red and alive.

He pressed his hand on Cinder’s burning flank. He gave her the fruit. He put every ounce of weight he had behind it.

Her flank climbed past what a hand could take. The heat burned through his palm. He kept his hand there anyway.

He reached for his lifespan to pay for it.

Here it goes. Whatever’s left of me.

The fruit went into her mouth.

The system flashed before the evolution began.

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

[ TIER EVOLUTION THRESHOLD — OPEN ]

Beast: Cinder (Ember Wolf)

Tier: 1 → 2

Form: Ember Wolf → Uncertain

Catalyst: Embercore Fruit (consumed)

Resonance anchor: The cold that took her

Environment: Under the Hearthstone Chamber (confirmed). Density unconfirmed.

Cost: pending...

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Aiden didn’t get to finish reading.

The evolution threshold opened like a furnace door. He shielded his eyes from the flames rising from Cinder. The heat off her doubled, then doubled again.

The frost line broke and retreated up the passage toward the Ice Heart.

The old handler dropped his tools and opened his mouth to shout.

That shout was his whole plan. It would carry up the stair and bring the hook-men down at a run.

The shout barely left his throat.

The lamp went out first.

The chamber went dark. Cinder’s ember glow reached only a few feet beyond her.

Nyx was already behind the man, hidden in the dark, its pale eyes fixed on him.

Then Nyx’s paw went through the old man’s throat.

Aiden did not see it happen. He saw the shout stop in the middle. He saw the man’s hands fly to his throat, but no sound came out.

The young handler spun toward the place where the lamp had been.

Neither of them got another sound up that passage.

Then the Ice Heart answered.

It blazed colder. It threw a wall of cold down the passage at Cinder’s rising fire.

The cold hit Cinder in the middle of the sink. Frost raced over her legs and climbed toward her burning flank. Heat poured from her body, melting it away wherever it reached her.

Steam filled the chamber. Frost formed across the walls and rained down onto Aiden’s shoulders.

The line moved. A foot toward Cinder. Then a foot back, stones going hot, then cold, then hot again.

The chamber shook. The cat flattened itself against Aiden’s shoulder and dug its claws into him, too frightened to let go.

Aiden was braced over Cinder, his hand buried in the fire from her flank.

Miasma saw it.

She came off his shoulder with her spines flaring green. She moved in front of his face and pointed.

Not at Cinder. At the floor.

At the frost line, which had stopped retreating. It had started advancing again, a finger’s width at a time.

Cinder’s legs shook. Her head dropped toward the stone.

She was losing the line. The cold was winning.

Then she looked at him.

Through the steam and the fire, she found him. The same eyes she used when she put her head against his chest and did not have to.

Aiden held them.

You burned your own den down. I burned my life.

We went out the wall for the fruit. We passed the Ice Wolf and stood in front of the golden Hound. We got here.

I don’t know if you love me. I know you have a place beside me, and nobody takes it.

He pushed everything he had left down the bond.

So hold it. Hold it and become the thing that walks back to Harken Vane. Show him what he threw away.

A tear left Cinder’s eye and vanished into steam. She still had the same gaze as when she pressed her head against his legs and just stayed there.

Then she lifted her head off the stone. She dug in and drove her shoulder into the cold.

Her flames climbed higher. They burned hotter.

The grey stopped. It melted. It went back a foot, then another.

Cinder began to grow in the burning space she had created.

He felt it under his hand before his eyes caught up. The flank he was braced against rose. Her shoulder grew past his own. Bone moved under the changing coat.

The ember patches he had built back up one hammer-strike at a time spread, joined, and ran into each other.

Until there were no patches left.

Her dark coat looked like rough iron under a smith’s hammer, the black giving way to gold until nothing dull remained.

The heat came off her in a wall now. Not a line-fight. A wall.

The frost broke and did not come back. It died at the cradle’s feet.

The young handler dropped to his knees. The heat was unbearable, even this far from Cinder. The old one only stared.

Cinder howled.

Her body arched under Aiden’s hand. Fire burst from her mouth and rolled across the frost. The Ice Heart answered with a blast of cold. Heat and frost crashed together around her.

Aiden kept his hand on her flank and fed the bond whatever years he had left.

He dropped to one knee, the joints spent. His fingers were matchstick thin and bony on Cinder’s new coat, and his chest caught with each burning breath.

He felt the pull he was waiting for.

Then he felt it stop.

Then he felt it reverse.

Something moved through the bond.

It came from Cinder. Into him.

Warmth spread through his arm and into his chest.

She was giving him something.

His hand was still on her flank, the golden light filling his fingers.

Miasma’s spines stood rigid at the edge. Nyx kept the darkness around the passage.

Aiden had half a second to understand what was happening.

That’s the wrong direction.

Why is it going the wrong direction?