The cave swallowed them whole. One moment David was standing at the entrance with the fading light of the Expanse at his back and the next he was inside with the darkness pressing against his face and his hands and his chest. He called up fire without thinking, a small flame in his palm, and the light pushed the shadows back far enough to see the walls and the floor and the tunnel that sloped down into somewhere his father had gone before him.
Lucas was right behind him, his breathing loud in the enclosed space, his hand on David's shoulder like he needed to know he was there. Becca was quieter, her footsteps barely audible, her shadows moving in ways that had nothing to do with the light from David's flame.
"It goes deep," Lucas said, his voice echoing off the walls. "How far down do you think he went?"
David looked at the journal and the map his father had drawn and the symbol that marked the vault's location somewhere beneath the mountain. "Far enough that no one would find it by accident."
They started moving and the tunnel sloped down at an angle that made David's legs ache after the first few minutes. The walls were smooth here, too smooth, like they'd been shaped by something more deliberate than water or time. His father's work maybe or something that had been here long before the Phoenix Clan was even a name.
Becca stopped suddenly and her hand found David's arm. "Do you feel that?"
He stopped and listened and felt. The mana was different here, thicker than it had been outside, but there was something else too. A pulse, slow and steady, like a heartbeat coming from somewhere deep in the mountain. The crystal in his pocket was warm against his thigh and pulsing in time with whatever was waiting for them below.
"That's it," he said. "That's what he built. What he died for."
Lucas moved up beside them with his face lit by the fire in David's hand. "It's alive. Whatever it is, it's alive."
They kept moving and the tunnel opened into a cavern after another hour of descent, a space so large that David's flame couldn't reach the walls. He threw more fire into the darkness and watched the light catch on stone formations that looked like they'd been growing for centuries. And in the center of it all was something that made his breath catch in his throat.
A door. Not a door like anything he'd seen in the Expanse or on Earth, not metal or stone or anything he could name. It was light somehow, light given form, light that pulsed with the same rhythm as the crystal in his pocket and the fire in his chest and the blood in his veins.
Lucas let out a low whistle. "Your dad didn't mess around."
David walked toward it and his feet moved without him telling them to, the fire in his hand growing brighter as he approached. The door responded and the light pulsed faster and brighter like it recognized him, like it had been waiting for him to come home.
Becca grabbed his arm before he could touch it. "Wait. We don't know what it does. We don't know what happens when you open it."
David looked at her and the concern in her eyes and the shadows gathering at her feet like they were ready for anything. "My father built this for me. He sealed it with his blood and his power and whatever else he had. It's not going to hurt me."
"You don't know that."
"I know he loved me." He kept his voice steady. "I know he died to protect me. I know whatever's on the other side of that door, he wanted me to have it." He reached for the door and pressed his palm against the light.
The world didn't disappear exactly but it changed. The cavern was still there and Lucas was still behind him and Becca was still beside him with her hand on his arm. But there was something else now, something layered over everything, a presence that had been waiting for him to arrive.
The light from the door spread across the cavern floor and climbed the walls and touched the ceiling far above them. Where it touched, symbols appeared, the same symbols from his father's journal and his mother's necklace and the crystal in his pocket. They covered everything, thousands of them, millions maybe, and David realized they'd been there the whole time, carved into the stone and waiting for someone who could make them visible.
Lucas turned in a slow circle, his mouth open. "David. What is this place?"
He didn't have an answer. He walked forward, drawn by something he couldn't name, and the symbols parted around him like water around a stone. The light from the door pulsed with his heartbeat and the crystal in his pocket pulsed with the light and somewhere deep in the mountain something was waking up after a very long sleep.
The door was open now. Not swinging open or sliding open, just open, the light that had been its surface flowing into the cavern like it had been waiting for permission to leave. Beyond it was a chamber, smaller than the cavern, lit by the same light that had been in the door. And in the center of the chamber, on a pedestal that looked like it had grown there, was something David had seen before.
The egg. The same one from his father's vision, the same one that had made his chest ache when he'd seen it in the crystal. But seeing it in the vision and seeing it in person were different things. In person it was larger, almost the size of his torso, and its surface shifted between colors that didn't exist anywhere else. The light that came from it was warm, not hot, and when he stepped into the chamber he felt something in his chest open up, something he hadn't known was closed.
Becca stepped up beside him and her voice was hushed. "Is that what they've been looking for? All this time?"
David moved toward the pedestal without answering. The egg pulsed with the same rhythm as the door, the same rhythm as the crystal, the same rhythm as the fire in his chest. He reached out and touched it and for a moment nothing happened. He just stood there with his hand on the warm surface, feeling it breathe beneath his fingers.
"It's sleeping," he said, more to himself than to them. "It's been sleeping for a long time."
Lucas came up on his other side, close enough to see but not touching. "What is it? Some kind of beast? Something from the old world?"
"I don't know." David pulled his hand back and the egg pulsed once, like it was disappointed he'd stopped touching it. "My father said the Phoenix Clan was formed to protect it. That they died protecting it. That's all I know."
Becca moved around the pedestal, looking at the symbols carved into its base, the ones that were still glowing faintly in the light from the egg. "These markings are old. Older than the clan markings I know. Older than anything in my family's archives." She looked up at David. "Whatever this is, it's been here a very long time."
David pulled the crystal from his pocket and held it up to the light. The crystal glowed in response, pulsing with the same rhythm as the egg, and the egg pulsed back like it was answering.
"We need to move it," he said. "Before they get here. My father said they were coming and if they find this, if they get their hands on it—"
"Move it where?" Lucas gestured at the egg, at its size, at the impossibility of carrying it anywhere. "We can't exactly put this in a backpack and walk back through the Expanse."
David looked at the crystal and the egg and the light that connected them. He thought about the second system in his mind, the shelter function that had been empty since he'd bought it, the space that was his and only his. He'd never put anything in there except the things he'd bought from the store, supplies and potions and equipment. But the shelter wasn't just for storing things he purchased. It was a place, a real place, a place that existed somewhere that only he could reach.
He didn't know if it would work. He didn't know if something this powerful, something this old, something that wasn't his to begin with could be stored in a space the system had given him. But he didn't have time to figure out another way.
"Give me a minute," he said, and closed his eyes.
He reached for the shelter the way he'd learned to reach for the store, the way he'd learned to reach for his fire, the way he'd learned to reach for everything the second system offered him. The space was there, waiting, empty, his. He pictured the egg in the center of it, pictured it resting in the light that lived there, pictured it safe and hidden and his to protect.
The egg pulsed once, twice, three times, and then it was gone.
Lucas stumbled back. "Where did it go?"
David opened his eyes and looked at the empty pedestal and the fading light and the symbols that were dimming on the walls. "Somewhere safe."
Becca was staring at him, her expression unreadable. "What did you just do?"
He didn't know how to explain it. Couldn't explain it without telling them about the second system, about the shelter, about everything he'd been hiding since the awakening. He looked at Lucas and saw the same question in his eyes, the same confusion, the same trust that had never wavered even when David gave him nothing to trust.
"I'll explain later," he said. "I promise. But right now we need to get out of here."
Becca opened her mouth to argue but the sound of footsteps stopped her. Coming from the tunnel, moving fast, more than one person, and they were almost there.
Lucas moved in front of them, his body already starting to shift, his density changing. "How many?"
"Four. Maybe five." Becca's shadows were pooling around her feet, rising up her legs, ready. "Armed. Professional. The same ones who attacked Kaito."
David pulled fire into his hands and faced the tunnel where the footsteps were getting louder. The pedestal was empty behind him and the egg was safe and whatever came next, whatever these people wanted, they were too late.
The first figure emerged from the tunnel and David let his fire rise to meet them.