Detailed Recap (TL;DR at the bottom):
After stopping for supplies, the party visits the organization that controls the water flow. The receptionist explains that the water becomes corrupted once put into the cistern, and negative effects have ranged from mild to deadly. The team accepts the job of heading down into the drained cisterns and investigating the cause of the corruption. The receptionist also mentions a notebook recovered from the cisterns, which mentions a giant creature.
The party sets out for the sewers, asking for information on the way. One woman shares a rumor of a mechanism that will point the way to help, but all other attempts to gather information meet with varying levels of failure. The party decides to embark into the cistern.
As they go into the depths, they notice there are no guards, and the doors are open. Upon entering a large room, they see light in a nearby corridor. When Calembel goes to check it out, the ground drops out from beneath her, dropping her into a pool of putrid water. Kilka goes to help her, but falls in herself. As the source of the light grows closer, Calembel notices stairs and swims toward them while Kilka grabs onto the rope. Unfortunately, Nasr, Miri, and Queso are not strong enough to pull her out, and the whole party falls into the water.
Upon reaching the stairs, the party looks up to see some shadowy figures looking down into the hole. They have lizard-like features, but are unlike anything the party has seen, and speak in an unfamiliar tongue. They leave, and the party embarks into the room the stairs lead up to. In it are two dead guards, their tongues swollen to the point where it blocked off their air supply. The party identifies the wheel the old woman spoke of in town, with Dwarven characters written on it. When turned, the wheel indicates a false wall, and the party goes through into a canal of disgusting water.
Unfortunately, Miri quickly manages to blow up the canal, revealing the flammable nature of the gunk. Finding keys on a guard’s body, the party progresses through one of the doors, their way lit by the burning canal, until they come across another wheel. It indicates northwest and southwest, and unsure of its intention, the party moves on to the left. They come across a stone dragon head dispensing exceptionally meta golden liquid. Miri and Queso fill containers with it, and the statues’ eyes light up. Noticing the jaw is hinged, the party moves on rather than continuing to take the liquid.
As they move on, they come across another wheel, but it points northwest as well as northeast, and the party once again moves on, unsure as to what it means. They soon come to a small room with a chest that slams shut as soon as they enter. Behind it is a blindfolded statue of an ancient god of reptilian life, no longer worshipped. After a few attempts to keep the lid open, Queso manages to get a key out of the writhing mass of maggots inside.
The key unlocks a door in the room, allowing the party to continue on into a large room. It contains three statues identical to the one in the smaller room, each holding lit torches and facing a chest in the center of the room. Once they all enter the room, the chest opens and an inordinate amount of water begins flowing out. With mighty roars, seven manticores emerge from behind curtains.
As the water rises, the party battles the manticores. After a few manticores fall, Kilka throws Nasr up to the top of the pillar where the chest is, in hopes he can force it closed. Queso blindfolds a statue, trying to replicate the effect of the other room. After managing to temporarily close the chest, stopping the water flow for a time, Nasr jumps to another statue and blindfolds it. He then tries to go past the curtains to see if anything would help, but encounters only a plaque with a useless riddle: “Locusts swarm where toads abide.”
Kilka goes down, and Queso, Miri, and Calembel work on taking down the remaining manticores. Nasr jumps back across the pillar and dives into the water, working his way to Kilka, but she succumbs to her wounds and dies before he can reach her. In a rage, Nasr rushes toward the final manticore, but Miri’s thought servant destroys it before he can reach it. Nasr nevertheless hacks at it with his sword, screaming in rage as tears stream freely down his face. Queso checks to confirm Kilka is dead, and mourns as Miri carefully walks up to Nasr and puts a comforting hand on his shoulder…
The party entered the cistern to investigate the water corruption. The source has not yet been found, an an encounter with manticores resulted in Kilka’s death.