He reached rank four on a morning when it was raining.
He had been tracking the approach for two weeks — the particular sensation of a cultivation breakthrough as it neared was like watching a tide come in: measurable, gradual, and then suddenly very close. He had spent the previous night in extended cultivation, not trying to force the advancement but loading the final measure of mage force into his dantian with the same patient pressure he'd applied to the compatibility barrier on Four Gods Mountain.
The rain on Space Mountain at dawn was cold and specific, each drop landing with the unhurried quality of rain that intends to continue for a long time. He sat at the summit in it, which was unusual enough that any student who happened to look would assume he was either eccentric or deeply in a cultivation state.
Both were currently true.
The advancement came without drama. The barrier — each rank had one, each with its own character — resolved with the particular smoothness that comes from having loaded exactly the right amount of pressure in exactly the right places. No heroic effort. No final charge. Just the steady accumulation of the previous months finding its equilibrium.
He opened his eyes.
The rain looked different.
Not visually — rain was rain, indifferent to cultivation rank. But his perception of the spatial element in and around each raindrop had changed. He could feel the micro-adjustments in the space particles as each drop displaced air, the tiny ripples in the spatial field around each point of impact. It was like looking at a familiar room and discovering that what you had thought were walls were actually windows.
He held up his hand. A raindrop hit his palm. He watched the spatial ripple spread from that point outward like a stone dropped in still water, fading at approximately a metre.
At rank four, his spatial perception had extended from the immediate area around his body to a radius of several metres. And within that radius, the resolution was — considerably better than before.
"Sirath," he said.
"I know," Sirath said. His voice had the quality it sometimes got when Aaron advanced — a contained satisfaction, carefully not excessive. "How does it feel?"
"Bigger," Aaron said.
"More precise would be the more accurate word."
"Both," Aaron said. "Bigger and more precise." He turned his hand over and let the rain fall on the back of it. "The Shard boundary — can I feel it now?"
"Not at rank four, no. The boundary is at a different scale than your current perception range." A pause. "But you have just moved significantly closer." He paused again. "More importantly — the activation sequence for the bridge function. I have been telling you that you need rank five for it. At rank four, with the crystal's amplification, you may be able to access the sequence's preparatory stages."
"What are the preparatory stages?"
"Think of it as priming a pump," Sirath said. "The full activation requires rank five and sustained spatial output at a level your current cultivation cannot sustain. But the preparation — laying the groundwork, aligning the formation nodes to the bridgehead configuration — that can begin at rank four." A pause. "I want to be honest: I do not know how long the preparation takes. I designed the sequence in theory. I never implemented it."
"Best estimate?"
"At rank four, with the crystal, working on the nodes individually — months. Perhaps four, perhaps eight. The nodes need to be realigned from stability configuration to bridge configuration, which requires touching them at the formation level and making adjustments without disrupting their primary function."
"Months," Aaron said. "While not disrupting the primary function. While not alerting the watcher."
"Yes," Sirath said. "All of those."
"Manageable," Aaron said.
"You say that with great confidence for someone sitting in the rain."
"The rain is fine," Aaron said. "I like rain."
A pause. "I know you do," Sirath said, with a quality Aaron had stopped trying to categorise — it was the way someone spoke when they had known you long enough to have memorised the small things. "I don't understand why, but I know you do."
Aaron smiled at the mountain in the rain. "Get used to it," he said. "We're probably going to be doing a lot of things in the rain."
— — —
He told Lysander about the rank advancement in the instructor's office that afternoon.
And about the response. The five symbols. The Greensiders.
And about the bridge function.
Lysander sat very still through all of it. When Aaron finished, he was quiet for a long time.
"The Tenders' records never mentioned a bridge function," he said.
"The Tenders maintained the stability array," Aaron said. "They didn't know about the secondary design. It's in the Void Catalog — it wasn't in the formation itself, it was in the mind of the person who built it."
"And you have access to that mind."
"Yes."
Lysander exhaled slowly. He looked at the map on the wall — the old coastline. "If the Greensiders can cross to this side —"
"They know about the organisation," Aaron said. "They've known about it for three hundred years. If they can cross, they bring that knowledge with them. Contacts, capabilities, information about adjacent Shards that we don't have."
"And the risk?"
"The risk is that the organisation detects the bridge activation and intervenes before the crossing is complete." Aaron paused. "And the risk is that the Greensiders are not what they appear to be." He had thought about this carefully. "Aela Voss wondered whether the symbol was a greeting or a warning. We don't know enough about who they are to rule out either possibility."
"Then why proceed?"
"Because doing nothing is also a choice with consequences," Aaron said. "The disturbances are accelerating. The organisation is actively suppressing anyone who gets close to understanding what's happening. The Greensiders have been trying to reach us for three hundred years." He paused. "At some point, the cost of caution exceeds the cost of action."
Lysander looked at him. "You've thought about this thoroughly."
"Yes."
"You're ten years old," Lysander said. He said it not as a challenge, Aaron thought, but as the observation it actually was — a genuine effort to reconcile the fact with what was in front of him.
"I know," Aaron said. "I have time to be wrong and try again. That's the advantage."
Lysander was quiet for another moment.
"The tower," Lysander said. "You mentioned needing access."
"The formation network anchor is in the tower's foundation," Aaron said. "The bridgehead preparation needs to begin there. It's the primary node."
Lysander looked at the wall.
"The tower's upper levels are restricted," he said. "Access requires the headmaster's approval." He paused. "I have never requested access, in eleven years, because I did not have sufficient reason to explain why a spatial-theory instructor needed access to a restricted structure." Another pause. "That calculus has changed."
"You'd approach Solen," Aaron said.
"I'd approach Solen," Lysander confirmed. "But I need to think carefully about how. If the watcher is — thorough — a request from me for tower access, following several months of elevated activity in our small group, could be noticed."
"Do you need to request access officially?" Aaron asked.
Lysander looked at him. A careful look.
"The tower has a maintenance access point," Lysander said, slowly. "Used by the formation-maintenance staff for the lower-level array upkeep. It bypasses the registration system." He paused. "I know where it is. I've never used it."
"Then we use it," Aaron said. "Not repeatedly — once, to assess the foundation node's current configuration and determine what preparation the bridgehead needs. That gives us a specific plan."
"And when we execute the plan?"
"Through the same access point, at intervals irregular enough to not be a pattern." Aaron paused. "Or through the front entrance if the political situation changes."
"What would change the political situation?"
"Solen," Aaron said. "The headmaster knows about the network. He's been sitting at rank eight for thirty years. If there's a reason he stopped advancing, it's the same reason Lysander wondered about — something he learned about what lies beyond rank eight." He looked at the map. "I want to talk to him. Not yet. But eventually."
"He's observant," Lysander said. "If you approach him before you're ready, he'll see more of the situation than you want him to."
"I know." Aaron stood. "Two months before the next crossing attempt. One month to assess the tower's foundation node. One month to begin preparation, if it's possible." He picked up his bag. "And in between all of that: class, cultivation, artifact work, and not appearing to do anything out of the ordinary."
Lysander watched him head for the door.
"Aaron," he said.
Aaron stopped.
"You are the most organised ten-year-old in recorded history," Lysander said.
"I'll try to take that as a compliment," Aaron said.
"It is one," Lysander said. "Most emphatically."
Aaron left.
Outside, the rain had stopped and the campus was clean and silver, the stone paths dark with water, the silver tower reflecting the afternoon light off its wet surface. He stood in the main courtyard for a moment and looked up at the tower.
Somewhere inside its foundation, three thousand years old, a formation waited for the second half of its function.
He was going to activate it.
"Are you frightened?" Sirath asked.
"You asked me that before. I said the wrong word was fear."
"That was then," Sirath said.
Aaron looked at the tower.
"Yes," he said. "A little. That's appropriate."
"Yes," Sirath said. "It is."
Aaron went to his afternoon class.
He had a test to prepare for, and a cultivation cycle to complete before evening, and a formation node to assess on the weekend.
One problem at a time.
Always one problem at a time.