He came straight from the morgue, still carrying the smell of the job. Mara opened the door before he knocked, which meant she had heard him on the stairs. She had a notebook open on the kitchen table and two cups of tea already made.
She had a list. Of course she had a list. He had known she would have a list before she opened the notebook and turned it to the relevant page and set it on the table between them.
What he had not known was how long the list would be. The page was filled front and back in her compact precise handwriting. Each entry dated. Each entry structured the same way: ability deployed, followed by the debt event designation, followed by the specific cost, followed by duration and recovery notes where applicable.
He read through it in order.
The first four entries were Stasis uses, each one generating a memory loss of approximately six hours, each one with the specific date range of the lost memories noted with the careful documentation of someone who had learned to reconstruct what they had lost from secondary evidence.
Then the entries changed. Between Stasis uses, scattered across the two-year timeline, passive collections appeared. Not ability-triggered. Not tied to a specific deployment. Collections that arrived without direct cause in the way interest arrived on debt: not because you had done anything new, but because the outstanding balance existed and the system had decided to reduce it on its own schedule.
Spatial orientation, minor, permanent. Color distinction at low light levels, minor, permanent. Proprioceptive precision, right side, eight percent, permanent.
He looked up from the list.
"You've been paying passive costs every three to four months," he said.
"On average, yes." She was sitting across from him with her hands around the cup of tea she had not drunk.
"The passive collections began after the fourth Stasis use. Before that, the system only collected in response to ability deployment." She paused. "I believe the threshold is related to the outstanding balance reaching a specific density.
Once you carry enough outstanding debt, the system begins collecting independently of your actions."
"The interest mechanism," he said.
She looked at him. "That is a useful framework," she said. "I had been thinking of it as passive collection but interest is structurally more accurate. The longer the debt remains outstanding, the more the system collects beyond the original obligation." She looked at the list.
"Fourteen outstanding. I have had fourteen events where the system generated a debt that has not yet been collected." She touched the notebook.
"The interest on those fourteen has been running for varying periods. Some for over a year."
"What would it take to pay them down?"
"I have thought about this extensively and I do not have a satisfactory answer." She set down her tea.
"The system does not offer a voluntary repayment mechanism. There is no option I have found to proactively pay a debt before the system chooses to collect. The collection timing is entirely on the system's schedule." She looked at him.
"The only thing I have found that appears to affect collection frequency is the compound. Delaying the collection window does not eliminate the debt but it has, in my observation, reduced the passive collection rate. I believe this is because the active debts are nominally extended, which creates the appearance of recent collection activity that satisfies some threshold in the system's accounting logic."
Kael thought about that.
"The system tracks activity level," he said. "Not just balance. If the compound makes recent collection activity look continuous, the system reads you as a less delinquent account."
"That is my hypothesis. I have not confirmed it." She looked at the list. "What I have confirmed is the pattern in your first cost. The sensory series."
He looked at her.
"Fifteen percent tactile in the right hand," she said.
"What category would you place that in?"
"Sensory reduction. Physical input."
"Yes. Now look at my passive cost list." She pointed to the entries he had noted. "Spatial orientation. Color distinction at low light. Proprioceptive precision. What do those have in common?"
He looked at the list.
"Sensory," he said. "All sensory reductions."
"All physical input reductions," she said. "The system does not take abilities. It does not take cognitive function. It does not take memories in the passive costs, only in the active Stasis costs which are in a separate category." She looked at him steadily.
"The system's passive cost pattern is consistent across both my data and now yours. It collects from the physical senses. It reduces your investment in the surface world's physical input."
"Making us more Rift-dependent," he said.
She nodded once. "The abilities enhance perception of the Rift layer. The costs reduce perception of the surface layer. Over time the balance shifts." She paused.
"Thomas Aiken's account, which I obtained from a contact before any of this began, described a progression he called the thinning. The feeling, late in his engagement with the system, that the surface world had become less real than the Rift."
She looked at her hands. "He described it as a gradual and irreversible reorientation."
"And when the system closes," Kael said, thinking through the implications, "the abilities go. But the sensory reductions stay."
"The costs are permanent," she said. "The abilities are not."
The room was quiet.
Kael looked at the list again. He thought about Aiken. Eleven years in the system, seven abilities, twenty-two costs, the slow and specific erosion of his physical-world investment until the surface felt like the layer and the Rift felt like home. He thought about what it meant to be built for something over the course of eleven years.
"There has to be a payoff condition," he said. "A system that only consumes is a system that destroys its own resource base. If the system reduces our physical-world investment until we become non-functional in the surface world, it loses its collection mechanism."
"Unless the collection mechanism is not the end goal," she said.
He looked at her. She was looking at the notebook. She did not know about the well. He had not told her yet. But the direction of her thinking and the direction of his were arriving at the same destination from different angles, and he thought: this is what it is worth to have someone think alongside you rather than at you.
"The well," he said.
She looked at him.
He told her about the well.