In the fourth year of the eastern expedition, Orren wrote a document.He wrote it over three months, which was a long time for a document of its length — forty pages — but which Yssel, who had been observing the process, wrote to Kael was the appropriate length of time for Orren to do what he was doing. He was making conscious what was instinctive. He was finding the language for the thing he did without language.The document was titled: Notes Toward a Practice of Stabilisation.Kael read it when it arrived and then set it down and thought about it for a day before reading it again.Orren had written about the stabilisation gift as a relationship rather than as a capacity. Not something he did to a room, but something he did with a room — a form of listening that was also a form of presence, a quality of attention that registered the frequency of the people in proximity and responded to what it registered, not to fix it but to companion it. The stabilisation was not the reduction of d

He did not often dream about the hollow.The hollow was, in waking life, so present that it needed no representation in sleep — it was there when he woke and there when he worked and there when he sat at the east wall and listened to the substrate and there when Sera read across from him in the archive. The hollow was ambient. It did not need the particular grammar of a dream to be present.But in the forty-first year, in the deep winter before the eastern spring's fifth year, he dreamed about it.In the dream, the hollow was a place he could enter. Not his hollow — a hollow in the landscape, in the way of a cave or a clearing, a space defined by what surrounded it. He walked into it. The amber was everywhere — not the amber flame in his palm, but ambient amber, the substrate's frequency made visible in the dream-grammar that could show what waking was not equipped to see directly.In the hollow, there were people.Not all the people he knew — not Lysse or Tal or Mira or Sera or Yssel.

The three months before the activation were the most organised three months the Collegium had experienced.Mira had the second network communication out within a day of Kael's instruction — six hundred letters, through the full network cascade, reaching all thirteen thousand registered carriers within two weeks. The letter said: the eastern spring is in pre-activation. The event will occur within six months to one year. Here is what to expect. Here is what to do.The what to expect section was Preth's contribution — she had been building the frequency-effect model for six months and had it ready when the timeline moved. The Durnholt formation would register the eastern activation. The ambient substrate frequency in the Greywood and within its activation radius would increase significantly. Carriers sensitive to the deep substrate would feel the change. Carriers with less substrate sensitivity might feel something they could not immediately identify — a quality of warmth, a sense of the

Yssel's final letter before the activation arrived six days before the event. She knew it was six days before the event because the frequency profile had entered the terminal pre-activation phase — the phase that, based on retrospective analysis of the Durnholt formation's crystallisation, lasted five to seven days before the event itself."Five to seven days," she wrote. "I am going to be here. Renn is here. Sael is here. Orren is here. Veth is here. Three hundred and twelve members of the keeping-the-hum communities from across the eastern valleys have gathered at the formation site or in the surrounding hills. They have been gathering for two weeks, drawn by the frequency the way Renn said they had always been drawn when the frequency called them to gather.""The formation site itself: the crystal is twenty-nine inches across. It has grown seven inches since I arrived four years ago. The amber at the site is visible to ordinary sight now — not just to those with substrate sensitivit

The letter arrived in eight days, as he had known it would, and it was the longest letter Yssel had ever written.He read it in the archive, alone, with the door closed."The activation happened at dawn," she wrote. "I was awake. Sael was awake. Orren was awake. Everyone who had been sleeping near the formation site was awake, though none of us had agreed to be awake — we woke because the frequency changed, and the change was enough to bring us from sleep without any other signal.""The formation site at dawn: the crystal was warm to the touch, warmer than the ground around it had been, warmer than anything in the environment should have been at dawn in early spring. The amber was visible — not visible the way it had been for the past week, not just a warm glow in the stone, but present in the air above the stone. A column of visible amber frequency, perhaps four feet tall, above the formation.""Sael stood at the edge of it and held her hand into the column. She said later that it fel