The Cistern and Aqueduct
Noon-time
Zachariah Rat
You depart your fellow delvers in the dwarven pipelines to scout ahead. Your destination: the Inverse Spire, one of the several purported stops on the way to the Urchin Queen's Court. Treating with the Urchin Queen, the mistress of Vornheim's beggars, will grant the Church of Vornheim a stronger defense against the White Way's incursion, but reaching the Queen will be fraught with buried dangers.
You know nothing of the Inverse Spire, save that your two fellow rats, now known to you as Fabus and Natter, claim the Rat King lives there. Upon finding you in the pipes, they've invited you to dinner there, so don't let's be late!

"Ey-oh! There's a bit of a swim here!" Fabus squeaks as the three of you slide down through the gargoyle's mouth and into the winding pipe.
"He don't mind I'm sure! He's a wharf-ratsy!" Natter calls.
With a PLOP, your three tiny bodies land within a large cave pool. The ceiling of the cave is vaulted, however, featuring man-carved archways. You swim towards the edge of the cistern, finding a cracked stone walkway encircling the entire body of water. The rushing of water nearby signals the presence of an ancient aqueduct.
Natter continues to squawk on, while Fabus resumes the sage task of leading the way. "We'll take the duct down Pool's-End-way, then through the Old Town, and then you'll have din with us at the Inverse Spire. I reckon you'll like Pool's End, especially if you're interested in--"
There is a long low rumble throughout the cistern, which Natter looks around for nervously.