All:
Skitter skitter. Hissss
The rat scampers ahead, leading the way though claustrophobic tunnels, every step growing cooler and damper as you descend beneath Corvis. Contrary to all the local geography that Tyra and Kneecap know, you seem to be in some kind of granite inclusion - a spur of solid stone that rises up within the bogs of the City of Ghosts. The walls are sturdier, but the hardness of the amterial seems to have persauded the designrs to make them smaller; the tallfolk often have to drop to their knees and crawl or move on all fours, trickles of limestone-water oozing down their necks.
After some time, the tunnel begins to curve to the left - south, unless your senses have been totally disoriented by the time underground... which is very likely. As it bends away, it starts to widen and expand vertically - the ceiling arches up steeply, some kind of cavern, while the floor falls away, leaving jagged channels where the ever-present sludge drains away in septic waterfalls.
This space is only partial, however; the cavern here seems to be half-collapsed, and the foundations of build have sunk into it. Craggy bricks affixed to mortared stone slabs have slumped down, the wall crumbling under it's own weight. A sturdy metal door is built into a gargoyle-carved archway on the side of the building, the remains of stairs jumbled precariously in front of it. You could probably pick your way through the fallen masonry to the door easily enough.
As you approach, a gust of wind moves the fetid air in the tunnel; the door crashes open, making Gavyn and the twitch Ryn sorcerer jump in surprise. The air comming from the dark doorway, blown open by the change in pressure, is icy.
Eyvind
You didn't have many swamps back home.. but it seems odd that a house fortuitously built on a stony foundation amidst the marshes of this city would be the one to subside.