They did not go looking for the root that night.
Not because they did not want to — but because Wei Liang stopped Ye Mingzhu at the north entrance of the underpass, three steps into the walk that would have taken them into the residential blocks, and said: "Not tonight."
She stopped.
"You've been awake since before six this morning," he said. "You worked a night shift before that. The combat form ran for eight minutes against something twice the size of the first entity and the cold got through at the edges — I felt it." He paused. "And we don't know what the root is. Walking toward the darkest place in this neighborhood at midnight without knowing what's there is not a plan."
A silence.
"We need information first," he said. "Then we go."
Ye Mingzhu stood at the underpass entrance for a moment, looking at the residential blocks beyond. The streetlamps on the far side of the road burned steadily. Ordinary yellow light, ordinary shadows. Nothing outwardly wrong.
"How do we get information?" she said.
"The cores told me what Void Fragments are. The root will be different — larger, older, more complex. I don't know what it is yet." He paused. "But the cores also told me it doesn't move. Which means it's been here long enough to settle. Long enough that someone might have noticed something."
Ye Mingzhu turned and looked at him in her hand.
"You want me to ask around."
"Carefully. Not about dark entities or missing light. Just — whether anyone has noticed anything strange. Places people avoid without quite knowing why. Buildings that feel wrong. Areas that have been cold longer than the season explains."
Ye Mingzhu considered. "Chen Rui grew up in this neighborhood."
Wei Liang was quiet for a moment. "You'd tell her?"
"No. I'd ask her without telling her." She looked toward the residential blocks again. "She knows every street within six blocks of here. If there's somewhere people have been avoiding she'll know about it."
Wei Liang thought about the girl who had turned around three times during one class to show Ye Mingzhu things on her phone, who had noticed the bag was sitting differently, who had asked in a quiet voice whether everything was okay and then said tell me if you need anything and meant it.
"All right," he said. "Tomorrow."
Ye Mingzhu walked home.
She slept for seven hours, which was more than she usually allowed herself and which Wei Liang considered a minor victory. He spent the night on the desk under the lamp, absorbing steadily, and when she woke at six forty he was at full capacity and had been for two hours.
[Light Energy: 25/25]
She lay in bed for a moment looking at the ceiling, then sat up and looked at the desk.
"Did you sleep?" she asked.
Wei Liang considered the question genuinely. "I don't think I sleep. I was absorbing and thinking."
"What were you thinking about?"
"The root." He paused. "And what it means that Void Fragments share one. A single source generating multiple entities across a neighborhood — that implies the root has been here long enough to extend its reach significantly. And the Fragments I've seen so far are relatively young. Eleven days. Two weeks. But if the root precedes them—" He paused. "It could have been here for months. Longer."
Ye Mingzhu was quiet, looking at the window where the pre-dawn light was just beginning to grey the curtains.
"The neighborhood has always felt a little dim," she said. "I thought it was just the building density. Old blocks, narrow streets, not much direct sunlight." She paused. "But I've been here eight months and I can't remember the last time the back alley felt normal."
Wei Liang was still.
"You moved here eight months ago," he said.
"Yes."
"And in those eight months you've never thought the alley felt right."
A pause.
"No," she said. "But I didn't think that meant anything. I just thought it was a dark alley."
"It probably was darker than it should have been for eight months," Wei Liang said slowly. "Which means the root has been active for at least that long. Possibly much longer — the Fragments I've encountered were recent growth, but the root itself could be older by years."
The grey light outside the window brightened imperceptibly.
"Years," Ye Mingzhu said.
"The darkest place in a neighborhood doesn't become the darkest place overnight," Wei Liang said. "It accumulates. Light drains slowly enough that people adjust without noticing. They walk faster through certain streets. They stop sitting in certain parks. They decide, without deciding, that somewhere just feels wrong." He paused. "And then eleven days ago the first Fragment formed, which means the root reached a threshold — it had stored enough absence to start extending outward."
Ye Mingzhu got up and opened the curtains. Morning light, thin and grey and overcast today.
[Light Energy +0.1]
Slower. Cloud cover.
She looked at the sky. "It's going to rain today."
"Yes." Wei Liang had felt the change in the light quality already — diffused, scattered, the direct sun source muffled behind cloud layers. Absorbing would be slower. "We should find Chen Rui early. Before the rain."
Chen Rui arrived at school at seven fifty-eight, two minutes before the bell, with a large umbrella and the slightly harassed expression of someone who had checked the weather forecast, ignored it, checked it again, and then grabbed the umbrella at the last second.
She saw Ye Mingzhu at the classroom door and her expression shifted immediately into something more alert.
"You slept," she said.
"I did."
"Good." Chen Rui fell into step beside her. "You look less like someone who is definitely not fine but keeps saying they are."
Ye Mingzhu sat down at her desk. Chen Rui sat backward on her chair the way she always did, arms folded on the backrest.
"I wanted to ask you something," Ye Mingzhu said.
"Anything."
Ye Mingzhu chose her words with care. "You've lived near Fenglin Road your whole life."
"Born and raised. I know where every cat lives."
"Is there anywhere in the neighborhood that people avoid? Not for an obvious reason. Just — somewhere that has always felt off. That people walk past quickly without thinking about it."
Chen Rui looked at her for a moment with the expression of someone whose interest had sharpened considerably.
"This is about the thing you're working on," she said.
It was not a question.
"Yes," Ye Mingzhu said.
Chen Rui was quiet for three seconds, which for Chen Rui was a long time.
"The Wenhua Building," she said.
"Which one?"
"On the corner of Baixing Lane and Qingyan Road. The old cultural center — it's been closed for about six years. Used to be a community hall and library on the lower floors, administrative offices above." Chen Rui paused. "Nobody goes near it. The surrounding block is quieter than it should be for how central the location is. There's a park directly across from it that parents started steering children away from about—" She stopped.
"About?" Wei Liang said, very quietly, from inside the bag.
Chen Rui went absolutely still.
She looked at the bag.
She looked at Ye Mingzhu.
"That," she said, in a voice that was remarkably controlled given the circumstances, "is a mirror talking."
"Yes," Ye Mingzhu said.
"From inside your bag."
"Yes."
A pause.
"About how long has that been happening?" Chen Rui asked.
"Two days."
Chen Rui looked at the bag for another moment. Then she looked at Ye Mingzhu with an expression that was cycling through several things in quick succession and landing, eventually, on something that was approximately: I knew something was happening and I am choosing to take this in stride.
"Parents started steering children away about three years ago," she said, continuing exactly where she had left off, as though she had not just been interrupted by a bag. "It happened gradually. The park just — stopped being a place people wanted to be. My aunt used to take her kids there every weekend and then one spring she just stopped, and when I asked her about it she said it didn't feel like a nice park anymore and she couldn't explain why." Chen Rui's voice was level. "The Wenhua Building itself has been closed since the organization that ran it lost its funding. Nobody's bought it. Nobody's rented it. There was a proposal to convert it to housing about two years ago that went nowhere." She paused. "I always thought it was just bureaucratic delay."
"How far from the convenience store on Fenglin Road?" Ye Mingzhu asked.
"Four minutes walking. Maybe five."
The building at the center of it all. The dark place that had been getting darker for three years while the neighborhood quietly adjusted and the park emptied and the surrounding block grew quieter without anyone marking the exact moment it happened.
Wei Liang was very still inside the bag.
"Chen Rui," he said.
She looked at the bag with remarkable composure. "Yes, mirror."
"You said parents started steering children away about three years ago. Has anything else changed in the neighborhood in that time? Any other places that feel off, that people started avoiding?"
Chen Rui thought about this seriously. "The stairwell of the building on the east side of Baixing Lane has been dark for as long as I can remember — the bulbs keep burning out and the residents keep replacing them and they keep burning out again. The residents on the upper floors use phone flashlights to navigate." She paused. "And the underpass on Qingyan Road. The lights have been flickering for a few weeks."
"Not anymore," Ye Mingzhu said.
Chen Rui looked at her.
"It was fixed last night," Ye Mingzhu said, in a tone that did not invite follow-up questions.
Chen Rui did not ask follow-up questions. She looked at the bag, then at Ye Mingzhu, and arrived at some kind of internal accounting that she did not share aloud.
"The Wenhua Building," she said. "That's where you're going."
"Eventually," Ye Mingzhu said.
"It's been locked for six years. The ground-floor windows are boarded. There are two entrances — the main one on Baixing Lane and a service entrance on the side street." Chen Rui paused. "My cousin works in the district planning office. He has access to the building registry. I can probably find out if there's a basement."
Wei Liang spoke before he had entirely decided to. "Is there likely to be a basement?"
"Old cultural center from the seventies? Almost certainly. They all had them — storage, mechanical systems, sometimes a small theater or meeting room below grade." Chen Rui looked at the bag with an expression that was somewhere between fascinated and resolute. "Do you need me to find out?"
Ye Mingzhu looked at the bag for a moment, at Wei Liang.
Wei Liang thought about the root. About the darkest place. About six years of emptiness in a building at the center of a neighborhood that had been slowly, quietly losing its light.
"Yes," he said. "Please."
Chen Rui nodded once, businesslike, and turned back around in her chair just as the teacher arrived and class began.
Ye Mingzhu opened her textbook. Under the desk, her hand rested for a moment on the outside of the bag.
Wei Liang absorbed the thin grey overcast light coming through the classroom windows and thought about basements.
[Light Energy: 25/25]
He was ready.
The question now was what ready would need to mean.
The rain came at noon.
Not heavily — a steady moderate rain, the kind that fell without drama and intended to stay for a while. The courtyard outside the classroom windows turned grey and the overcast diffused the light further, and Wei Liang found himself absorbing rain-light for the first time.
It was the most muted thing he had tasted. Not unpleasant — just quiet, everything softened and scattered by the water in the air, no direction to it, no sharp edges. Light from everywhere at once and from nowhere in particular.
[Light Energy maintaining: 25/25]
Not absorbing. Just holding.
During the lunch break Chen Rui disappeared for twenty minutes with her phone and came back with the expression of someone who had spent the time doing something efficient.
She sat down at Ye Mingzhu's desk and placed her phone between them, a building registry document open on the screen.
"Wenhua Building, constructed 1974, basement level confirmed — one floor below grade, approximately 340 square meters. Originally used as archival storage and a small theater. The theater was converted to storage in 1998." She paused. "The basement has one access point from inside the building and a separate external access via a stairwell on the east side of the building — technically a fire exit but it also functions as a service entrance. The external access has been padlocked since the building closed." She looked at Ye Mingzhu. "My cousin asked why I wanted to know and I told him I was curious about the building's heritage value."
"Thank you," Ye Mingzhu said.
"Don't thank me yet." Chen Rui looked at the bag. "How dangerous is this going to be?"
Wei Liang considered the honest answer carefully.
"I don't know," he said. "The Void Fragments I've dealt with so far were extensions of something larger. The root itself — I haven't encountered one before. I don't know exactly what it is or how it will behave." He paused. "I know its weakness is the same as the Fragments. Light saturation. But it will be older and more established and I expect considerably harder to overload."
"And Ye Mingzhu is going in there with you."
"Yes."
Chen Rui was quiet for a moment.
"Can she fight?" she asked. Not skeptically. As a practical question.
"She fought well last night," Wei Liang said. "Twice."
Chen Rui looked at Ye Mingzhu with an expression that was complicated and fond and concerned in roughly equal measure. "You fought something last night."
"Two somethings," Ye Mingzhu said.
"And you came home and slept like a normal person."
"I slept for seven hours."
"That's — " Chen Rui stopped. "Okay. That's actually good." She looked at the phone screen. "The external stairwell access. East side of the building, padlocked. If someone were to bring bolt cutters—"
"Chen Rui," Ye Mingzhu said.
"I'm just noting that bolt cutters exist and are purchasable at the hardware store on Renmin Street which is open until nine." Chen Rui put her phone away with the air of someone who was absolutely not going to be argued with. "I'm also noting that I have tomorrow morning free and I know the neighborhood better than either of you and I can wait outside and call someone if nothing comes out within a reasonable time window."
The rain fell steadily against the windows.
Ye Mingzhu looked at Chen Rui for a moment with an expression that Wei Liang was learning to read — the one where she was deciding whether to argue and calculating the likelihood of winning.
"Outside only," Ye Mingzhu said.
"Outside only," Chen Rui agreed immediately, in a tone that suggested she had already planned for this outcome. "I'll bring an umbrella."
Wei Liang absorbed the last of the overcast noon light through the window and thought about basements and roots and the particular quality of a dark that had been growing for three years undisturbed.
Tomorrow night.
[Light Energy: 25/25]
He would need every bit of it.