She took another scorching breath and pushed forward, her shoulders bent as if she were lifting a heavy weight. There was nothing around her but fire. She would die in the fire, she thought, burning up like a feather, not even a footprint left on the dirt of this alien world to mark that she had ever been there.

Jace, she thought, and took a final step. The flames parted around her like a curtain drawing back, and she gasped, falling forward, her knees hitting the earth hard. The Fireproof rune on her arm was fading, turning white, draining her energy along with its power. She lifted her head and stared.

The fire rose all around her in a circle, flames reaching for the scorched demon sky. In the center of the circle of flame knelt Jace; he was untouched by fire himself, on his knees, his golden head back, his eyes half-closed. His hands were flat on the ground, and from his palms poured a river of what looked like molten gold. It had threaded through the earth like tiny streams of lava, illuminating the ground. No, she thought, it was doing more than illuminating it. It was crystallizing the earth, turning it to a hard, golden material that shone like—

Like adamas. She crawled forward toward Jace, the ground under her turning from bumpy earth to a slippery glassine substance, like adamas, but the color of gold instead of white. Jace didn’t move: Like the Angel Raziel rising from Lake Lyn streaming water, he remained still as fire poured from him, and all around the ground hardened and turned to gold.

Adamas. The power of it shuddered up and through Clary, making her bones shiver. Images bloomed in her mind: runes, looming up and then vanishing like fireworks, and she mourned their loss, so many runes she would never know the meaning of, the use of, but then she was inches from Jace, and the first rune she had ever imagined, the rune she had spent the last days dreaming of, rose up in her mind. Wings, connected by a single bar—no, not wings—the hilt of a sword—it had always been the hilt of a sword—

“Jace!” she cried, and his eyes flew open. They were more golden than even the fire. He looked at her in utter disbelief, and she realized immediately what he had thought he was doing—kneeling and waiting to die, waiting to be consumed by the fire like a medieval saint.

She wanted to slap him.

“Clary, how—”

She reached to catch at his wrist, but he was faster than she was, and dodged her grip. “No! Don’t touch me. It isn’t safe—”

“Jace, stop.” She held up her arm, with the pyr rune on it, shimmering silver in the unearthly glow. “I walked through the fire to get to you,” she said over the cry of the flames. “We’re here. We’re both here now, understand?”

His eyes were manic, desperate. “Clary, get out—”

“No!” She clutched at his shoulders, and this time he didn’t move back. She fisted her hands in his gear. “I know how to fix this!” she cried, and leaned forward to press her lips to his.

His mouth was hot and dry, his skin burning as she ran her hands up his neck to cup the sides of his face. She tasted fire and char and blood on his mouth and wondered if he tasted the same thing on her. “Trust me,” she whispered against his lips, and though the words were swallowed up by the chaos around them, she felt him relax minutely and nod, leaning into her, letting the fire pass between them as they breathed each other’s breath, tasting the sparks on each other’s lips.

“Trust me,” she whispered again, and reached for her blade.

Isabelle had her arms around Simon, holding him back. She knew that if she let him go, he would tear down the slope to the fire, where Clary had disappeared, and throw himself into it.

And he would go up like tinder, like gasoline-soaked tinder. He was a vampire. Isabelle held him, her hands clasped over his chest, and felt as if she could sense the hollowness under his ribs, the place where his heart didn’t beat. Her own was racing. Her hair lifted and blew back in the hot wind from the immense fire burning at the foot of the plateau. Alec was halfway down the path, hovering; he was a black silhouette against the flames.

And the flames—they leaped toward the sky, blotting out the broken moon. Shifting and changing, a deadly beautiful wall of gold. As the flames trembled, Isabelle could make out shadows moving inside them—the shadow of someone kneeling, and then another, smaller shadow, bending and crawling. Clary, she thought, crawling toward Jace through the heart of the conflagration. She knew Clary had put a pyr rune on her arm, but Isabelle had never heard of a Fireproof rune that could withstand this kind of blaze.

“Iz,” Simon whispered. “I don’t—”

“Shh.” She held him tighter, held him as if holding him would keep her from shattering apart herself. Jace was in there, in the heart of the fire, and she couldn’t lose another brother, she couldn’t—“They’re all right,” she said. “If Jace were hurt, Alec would know. And if he’s all right, then Clary’s all right.”

“They’ll burn to death,” Simon said, sounding lost.

Isabelle cried out as the flames leaped suddenly higher. Alec took a halting step forward and then fell to his knees, put his hands in the dirt. The curve of his back was a bow of pain. The sky was whorls of fire, spinning and dizzying.

Isabelle released Simon and bolted down the path to her brother. She bent over him, knotting her hands into the back of his jacket, hauling him upright. “Alec, Alec—”

Alec staggered to his feet, his face dead white except where it was smeared black with soot. He spun, turning his back to Isabelle, shrugging down his gear jacket. “My parabatai rune—can you see it?”

Isabelle felt her stomach drop; she thought for a moment she might faint. She grabbed at Alec’s collar, pulled it down, and exhaled a hard breath of relief. “It’s still there.”

Alec shrugged his jacket back on. “I felt something change; it was like something in me twisted—” His voice rose. “I’m going down there.”

“No!” Isabelle caught at his arm, and then Simon said sharply, from beside her:

“Look.”

He was pointing toward the fire. Isabelle gazed at it uncomprehendingly for a moment before realizing what he was indicating. The flames had begun to die down. She shook her head as if to clear it, her hand still on Alec’s arm, but it wasn’t an illusion. The fire was fading. The flames shrank down from towering orange pillars, fading to yellow, curling inward like fingers. She let go of Alec, and the three of them stood in a line, shoulder to shoulder, as the fire dwindled, revealing a circle of slightly darkened earth where the flames had burned, and inside it, two figures. Clary and Jace.

Both were hard to see through the smoke and the red glow of the still-burning embers, but it was clear they were alive and unharmed. Clary was standing, Jace kneeling in front of her, his hands in hers, almost as if he were being knighted. There was something ritualistic about the position, something that spoke of a strange, old magic. As the smoke cleared, Isabelle could see the bright glint of Jace’s hair as he rose to his feet. They both began walking up the path.

Isabelle, Simon, and Alec broke formation and hurtled down toward them. Isabelle threw herself at Jace, who caught her and hugged her, reaching past her to clasp Alec’s hand even as he held Isabelle tightly. His skin was cool against hers, almost cold. His gear was without a single scorch or burn mark, just as the desert earth behind them showed no trace that moments ago, a massive conflagration had burned there.