The mortar at the integration point was holding.
That was the first thing I wanted to check. Before anything else. The integration point was where the dungeon dinsion t the channel infrastructure, and that join had been sitting under city pressure and Abyss-adjacent conditions for months now. Joins under those circumstances tended to develop opinions about their continued participation in reality.
This one had decided to remain sound.
I made a note of that in my coat pocket and straightened up.
Brenne’s halo illuminated the chamber with the sa steady quality it always had. Not warm. Not flickering. Just consistent. The sort of light that ca from sothing with its own philosophy about illumination and nothing to do with candles or hearths.
The channel ran ahead of us toward the fork Torvel had described. I had written it down when I drew the map. The water moved along the floor at about ankle depth.
The walls had the quality of stone that hadn’t been cut or placed so much as accumulated. Layers pressed together over ti until they collectively agreed to behave like barriers. They were holding.
The ceiling above them was stone as well. Correct stone. Solid. The entire structure had the feeling of infrastructure that had built itself and then made all the structural decisions internally without consulting anyone.
Vassara’s three stood behind her in their usual formation.
Brenne’s two held position at the rear. They had the specific kind of tired that didn’t seem to change regardless of what they were asked to stand inside.
"The air is different from the last ti," Vassara said.
Her head stayed level. Amber eyes forward on the curve of the channel where it bent toward the fork. She wasn’t looking at the walls, the ceiling, or the water.
"Different how?" I asked. "The last ti you were in this section was several months ago. Conditions that accumulate tend to show themselves eventually."
"The pressure is less."
She walked forward slowly.
"When I was here before, the boundary between the dungeon and the channel had a quality in this section. Not instability. Sothing pushing against it from inside."
She paused. Her tail moved once behind her.
"That quality is reduced."
"Sothing changed in the lower space," I said. "The pre-settlent area."
I checked the wall beside . Good stone.
"There was a presence there that has since relocated to the inn. The pressure you’re describing was probably downstream of that."
Solid join.
"The integration point held through the change," I added. "From an infrastructure perspective, that’s the best possible outco."
"That’s not what I’m concerned about," Brenne said.
She hadn’t spoken since the archway.
Brenne was looking up at the ceiling now. Her wings were tight against her back the way they always were in enclosed spaces, and her halo cast its light forward and upward in a way that illuminated the channel ceiling with very thorough and very unflattering detail.
"The boundary change may have destabilized the creature population in the deeper section," she said. "When substrate pressure alters, the things adapted to that pressure have to readapt. The process of readaptation in a dungeon environnt—"
"They’re rats," Vassara said.
"They are coordinated rats with unified behavioral patterns that suggest the substrate has modified their cognitive organization," Brenne replied. "That is a concern."
"That is not a concern I share."
"That is not the sa thing as it not being a concern."
They had been having so variation of this conversation since the archway.
The central question, as far as I could tell, was whether the things that lived in the dungeon counted as a problem in Brenne’s sense of the word. Which ant sothing that required her intervention. Or whether they were simply part of the environnt, which was Vassara’s position.
Both interpretations were technically correct.
The gap between them produced recurring argunts at regular intervals as we moved through the channel.
The rats arrived at the fork from the walls.
Not through them. From the gaps where the dungeon dinsion hadn’t fully sealed against the channel stone. Places where dinsional compression had left margins.
They ca out of those margins in the exact pattern Torvel’s people had described in their earlier surveys.
Unified mass movent.
Hundreds of them moving together.
Coordinated by sothing they didn’t individually understand but collectively expressed.
Their eyes reflected the light at the exact sa angle at the exact sa mont.
Brenne’s halo illuminated all of them at once.
"There are a great many of them," Brenne said.
"Yes," I said.
More than the earlier survey had reported.
"Which is the direction I’d expect the number to move," I added, "given how long this channel has gone without a proper walkthrough."
I looked at the walls.
"The walls have been busy."
I once had a guest who moved the dining table to the second floor rather than tell sothing was wrong with it.
Guests who addressed problems indirectly were always interesting. Understanding what they actually wanted required looking at what they’d done instead of what they’d said and working backward.
Now I had a swarm of rats.
They had organized themselves into a mass at a junction point. Blocking the path. At exactly the mont three people arrived to pass through it.
That suggested territorial behavior.
Or hunger.
Or possibly sothing else entirely that they were expressing using the only communication thod available to them.
I looked at them.
They looked back.
A hundred synchronized eyes.
"They’re waiting," I said.
"This entrance is where they’ve chosen to present themselves."
I gestured toward the fork.
"Whatever they’re trying to communicate, they’ve decided this is the appropriate mont to do it."
Which suggested it was probably about the section ahead.
Vassara had already walked to within two feet of the front of the mass.
She moved at the pace she used when approaching sothing she intended to address directly.
Her amber eyes were very still.
That was their default.
She held her head at an angle I had seen in the common room before. Directed toward the air in front of the group rather than toward anyone in particular.
"This section of the channel runs through substrate adjacent to my house’s territory," she said.
She directed the statent toward the rats. Or the air in front of them. Or possibly toward whatever organizing principle had brought them to the fork at this exact mont.
Her tone was the one she used for facts with legal implications.
"My house’s claim in these layers predates the current infrastructure by several centuries."
Nothing happened for a mont.
Then the rats moved.
They shifted to the sides of the channel. Pressing against the walls.
The center cleared.
They maintained formation along both walls. Facing inward.
They had created a corridor.
Vassara looked at the corridor.
She looked at it for about three seconds.
"I see," she said.
Flat delivery. Small pause in the middle.
"They acknowledged the claim," I said.
"They didn’t leave."
I considered that distinction relevant.
"I noticed that."
"Guests who follow around the building usually want sothing," I said.
"Not always food."
Sotis it was directions. Sotis they wanted to report a problem in a room I hadn’t checked yet. I’d even had guests who couldn’t speak the common language manage this very effectively.
I looked at the corridor of rats.
"The ones who wait at thresholds usually want sothing about the threshold."
Brenne still hadn’t moved from her position behind us.
"They are escorting you," she said.
There was a sharp edge in her voice.
"That is not the behavior of rats."
She looked at the walls of rodents.
"That is the behavior of sothing that has been given a function it did not originally possess. By a substrate that has altered the paraters of what it can do."
She paused.
"That should be taken seriously as a welfare situation."
"The welfare situation," Vassara said, "is that they are escorting us through their section of the channel."
She glanced down the passage.
"This is efficient."
"The welfare situation is that they are rats who have been cognitively restructured by a dungeon substrate and are now performing territorial functions for a demon noble they encountered ten seconds ago."
"I haven’t restructured anything."
"The substrate adjacent to your house has."
There was a brief pause.
"That is a separate matter," Vassara said.
"It is not a separate matter."
Brenne’s halo brightened slightly.
"The substrate adjacent to your house is the substrate that altered them. Your authority over that substrate ans—"
"My authority over the substrate does not extend to actions it took before my involvent."
"That is not how authority works."
"That is exactly how authority works."
I stepped forward into the corridor.
The rats stayed pressed against the walls as we passed.
Perfectly still.
Their eyes didn’t move while we walked beside them.
The corridor held its shape all the way to the fork.
At the fork, I checked the map notes in my coat pocket.
Left branch went deeper.
That was where the bracket section was.
That was where the survey work continued.
The rats stayed at the fork.
Covering both walls.
Leaving both branches open.
Just standing there at the junction with synchronized eyes and the patience of sothing that had accepted a job and wasn’t planning to quit anyti soon.
Brenne was still looking at them.
Her halo pointed directly at the mass.
"We cannot simply leave them here," she said.
"They live here," Vassara replied.
"They live here as cognitively restructured territorial escorts."
"Which is what they are currently doing."
Vassara looked down the left branch.
"Escorting."
She started walking without further discussion.
"And we are being escorted."
Brenne looked at the rats.
The rats looked at Brenne’s halo.
Nobody moved.
"I will co back to this," Brenne said.
She said it to the rats.
Then she followed Vassara.
I patted the wall at the fork.
Good stone.
The join between the two branches was solid.
I checked the mortar where the dungeon dinsion pressed closest to the channel stone.
Still holding.
Honestly, impressive work for sothing that had built itself.
Then I went after them.
The rats stayed at the fork until I passed the first bend in the left branch.
After that I couldn’t see them anymore.
But I could still hear the water moving along the channel floor.
The sa steady sound as before.
The sound of a channel that had decided its arrangent was satisfactory and had no complaints to file.
[SYSTEM LOG]
Eastern sewer channel: active survey. Party in left branch. Bracket section ahead.
Rat behavior: territorial claim acknowledged, Vassara of House Vaskareth. Escort formation maintained at fork. Classification: pending.
Brenne: welfare concern noted. Return visit stated. Open.
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