We go down when the light is almost gone. That's the rule Sunny made, and I follow it without question—the kind of question that would make her stop moving and turn to face me with that look, the one that says she already knows what I'm thinking and is waiting to see if I'll say it aloud.
The cathedral's skeleton rises above us as we descend the stone stairs, the ribs of its vaulted ceiling disappearing into shadow. Candlelight flickers somewhere far below. Sunny moves like she always does: steady, unflinching, her hand on the rail though she doesn't need it. She's never needed it.
"It's fainter," she says. Not a question.
I nod, then remember she's ahead of me and can't see. "Yes. Compared to yesterday, maybe thirty percent less."
"Or forty." Sunny reaches the bottom landing and stops. The golden sap hangs in the air down here like it always does, but she's right. It's thinner. The glow that usually bathes the lowest chambers in that warm, almost liquid light—the light that lets her move, hunt, survive—is dimming. I can feel her noticing the weight of it. The absence of it. "We have less time tomorrow morning."
The sanctuary was built by people who believed in salvation. That's what the old records said. They carved this place beneath a cathedral that was already dying, and they built it from faith and desperation and the knowledge that some things can only be fought in the dark. The golden sap seeps from the cathedral's bones at dawn—always at dawn, always reliable, always enough. It's the only reason Sunny can move through these depths without burning. It's the only reason she can leave.
I've been watching her leave every morning for three months.
We walk deeper. The corridors narrow. Our footsteps sound like a heartbeat that's learning to skip. Sunny tells me again how it works, though I've heard it before: the sap rises with the sun, feeds through the cathedral's structure, pools in the chambers, and holds until sunset. It's not magic. It's not even a miracle, she says. It's just biology. It's just the way these stones were built, the way they breathe, the way they remember what it means to be alive.
"As long as the sap flows," she says, "I can exist here and still exist above. The light keeps the darkness from touching me. At dawn, I can leave."
"And if it stops flowing?" I ask.
She doesn't answer. She doesn't need to.
The mechanism is in the deepest chamber, the one we've only just begun to explore. It's beautiful in the way that broken things are beautiful—a series of carved channels that run through the cathedral's ribs like veins, directing the sap downward and outward, distributing it through the labyrinth. The stone is smooth from centuries of flow. There are places where the sap has stained the rock gold, permanent as memory.
Ashlyn is standing beside the channels when we arrive. She's not supposed to be here. She's supposed to be in the upper chambers, monitoring the light levels, keeping watch. But here she is, her hands dark with something, her face turned away from the glow.
"Ashlyn." Sunny's voice doesn't change. "Step away from the mechanism."
"I can explain," Ashlyn says, but she doesn't move.
Sunny walks to the channels and looks. I watch her see it: the clay. The ash. The deliberate, careful blockages placed at regular intervals along the stone veins, each one reducing the flow, each one calculated to make the sap diminish day by day. Not a natural fading. Not a collapse of the sanctuary. Sabotage.
"How long?" Sunny asks.
"Seven days," Ashlyn whispers. "I started seven days ago."
The golden light flickers. In that flicker, I see Sunny's face, and I understand that she already knows why. She's already put it together—the way Ashlyn always finds a reason to come deeper, the way she asks about the sap's flow, the way she watches Sunny at dawn, standing at the threshold between the darkness and the light, ready to rise.
"You were going to leave," Ashlyn says. The words come fast now, desperate. "The threat below—we both know it's contained. The hunters topside will send someone eventually, or you'll decide it's safe enough, and you'll leave. You always leave. And I—" She stops. Breathes. "I have nowhere to go. I've never had anywhere to go. The darkness doesn't burn me the way it burns you, but it takes things. It takes time. It takes the shape of you. If you leave, I disappear."
Sunny is quiet for a long time. The candles burn. The sap continues its slow diminishment through the blocked channels.
"You could have asked me to stay," Sunny says.
"Would you have?"
The question hangs between them like smoke. Sunny doesn't answer, and that silence is its own kind of answer.
I understand then what I've been trying not to understand since I came down into this sanctuary. Ashlyn isn't the threat. The darkness isn't the threat. The threat is the choice—the one that Sunny has to make alone, the one that no one can make for her. Ashlyn blocked the channels because she believed that if the light faded, Sunny would be trapped. That if Sunny couldn't leave at dawn, she would stay. That if she stayed, they wouldn't have to be separated.
But trapping someone isn't the same as keeping them.
Sunny moves to the first channel. She scrapes away the clay with her bare hands. The sap begins to flow again, slow at first, then faster, the golden light returning to the stone like a heartbeat resuming. She moves from channel to channel, methodical, unflinching. The light grows stronger.
Then she finds Ashlyn's mechanism—the central blockage, the one that controls all the others. It's intricate. It's taken time to build. It's the work of someone who understands these stones as deeply as Sunny does.
Sunny destroys it. She uses a stone from the floor and brings it down again and again until the carved channels are shattered, until the mechanism is nothing but rubble, until the flow cannot be controlled anymore.
The golden sap floods the chamber. It's blinding. It's warm. It's the light of a thousand dawns all happening at once.
"Tomorrow," Sunny says, "I won't be able to leave."
She's not looking at Ashlyn. She's looking at the ruined channels, at the sap pooling on the stone floor, at the mechanism she just unmade.
"Without that," she says, "there's no way to redirect the light. No way to control it. No way to keep it contained to the dawn hours. It will flow continuously now. Which means it will burn me if I try to cross the threshold at sunrise. It means I can't leave."
Ashlyn makes a sound—not quite a word, not quite a cry.
"I'm choosing," Sunny says, "to stay."
But she's not choosing to stay with Ashlyn. She's choosing to stay in the darkness, in the labyrinth, in the place where the light is no longer a mercy but a trap. She's choosing to be the thing that hunts in the depths now, unflinching, with no dawn to rise into, no escape route, no way out except through the darkness itself.
The golden sap continues to flow. In its light, Ashlyn's face is visible, and I see that she finally understands: you cannot keep someone by making them unable to leave. You can only lose them by trying.
Sunny turns toward the deeper chambers, where the real darkness waits. She doesn't look back. She doesn't need to. She's already decided which parts of the truth we deserve, and she's already walking into the rest of it alone.
