Fen arrived on the forty-seventh day.
He did not arrive the way the others had arrived — not with the deliberate coordination of the escape, not with Dreya's management. He arrived because he had found them. Which was, Ren would learn, entirely consistent with how Fen operated.
He had been in Vareth for eleven days before making contact. He had located the hostel in two days — his Strata-reading bloodline registered their bloodline signatures from a significant distance, and he had spent nine days confirming what he had found before approaching, which was a level of operational caution that Ren had not expected from someone who had grown up on Floor Six.
Floor Six had been the children. The ones who had arrived young enough that the Cradle had been their first coherent memory.
Ren had been on Floor Four. He had not interacted much with Floor Six.
Fen knocked on the hostel door on a Tuesday morning. He was seventeen years old. He was carrying a bag with a broken strap that he had repaired with what appeared to be twine. He looked at Ren when the door opened and said: "I've been watching the building for nine days. I didn't want to come in wrong."
"You could have come in on day two," Ren said.
"I know," Fen said. "But I wasn't sure yet."
★ ★ ★
Fen's bloodline was the Strata-reader — a strong common bloodline, heroic-echo origin, which gave him the ability to perceive fracture network patterns directly. He had been one of the facility's most valuable research subjects in the final two years, specifically because his bloodline performed differently from the Remnant-based approaches the researchers had been modeling.
He was also, Ren found in the first three hours, the person most likely to make something in any given room slightly funnier than it had been before he arrived.
This was not a bloodline capability. It appeared to be an inherent quality.
"Do you do that intentionally," Ren asked him on the first evening.
Fen looked at him. He had a specific expression he used when being asked something that he found odd in its phrasing. "Do I do what intentionally."
"Make things —" Ren looked for the word. "Lighter."
Fen thought about this for a while. He was, Ren would learn, genuinely thoughtful about questions that surprised him. "I don't know," he said. "I started doing it on Floor Six because it seemed like if I didn't, everyone was going to stop talking. And then I kept doing it because it worked." He paused. "Is that intentional?"
"I'm not sure," Ren said.
"Me either," Fen said. Then: "Is it a problem?"
"No," Ren said.
Fen nodded, with the expression of someone who had been checking. "Good."
★ ★ ★
Ren thought about Fen's question for several days. Is it intentional.
He thought: Fen developed a behavior in response to a specific environmental condition. The behavior worked. He continued it. The continued behavior became, over time, something he did without deciding to do it.
He thought: this is how most of my behaviors work. The difference is the conditions that produced them.
The facility's conditions had produced behaviors that worked in the facility. Fen's conditions had produced behaviors that worked in a room with other people.
Both of them were running adapted responses. The responses were adapted to different environments.
He was adapting. Slowly. The direction of the adaptation was toward something he couldn't yet name.
He thought: Fen is further along this specific adaptation than I am.
He thought: this is useful information. Pay attention.