Into the Cesspool
This is not their first time in sewers, but the Nuln sewers are very different from those of Middenheim or Bogenhafen. They are much more... grander. They still smell just as bad though. Large hallways connect with huge cisterns, crossroads an pipes. Plenty of sidebranches lead to other parts of the sewers. The deeper they go, the more the sewer system is in disrepair.
The Shank Gang Smugglers
The place is guarded by a gang of criminals, some of them armed with rifles. After the smoke clears and the blood is wiped from their blades, the heroes managed to capture one of the Rogues. He is part of the Shank Gang, well known smugglers. Amongst their ill gotten gains, the adventurers find a 3kg bag of powdered warpstone, hidden in an encrypted box engraved with the mark of Tzeentch. They also find plenty of gold and find the floating boxes filled with saltpeter and marked by the sign of the Saltpeter Men.
They decide to head back to the surface to inprison the gang member and destroy the warpstone.
Solar leads an impressive ritual that allows the warpstone powder to be obliterated.
Even though they had a busy night, the adventurers decide to return to the sewers.
Vile Ratmen and Fouler Cultists
Following these signs, they come upon a large Canal that gradually slopes downward. Here, disaster strikes as the vile Ratmen have set up deadly traps. Sgt. Friedbald Erzbergen perishes by a cruel scythe trap that impales him completely. As they go deeper, the sound of rushing water intermingles with strange chanting.
The slope exits in a humongous large circular shaft that runs very deep. Various pipes eject foul sewage. A walkway leads to further tunnels and ducts. The chanting comes from Nurgle cultists that have gathered around eight bonfires. They are performing a mass ritual, involving human sacrifices. On top of that, the heroes spot a group of Skaven in a nearby opening, eagerly awaiting something. And on top of that, across the gap stands the giant figure of Vuluwvar Head Eater, Champion of Chaos (see Session 32). The rotten albino brute slowly draws his massive two handed axe and wanders casually towards the interlopers.
Obviously it is on now! As the crew wades trough hordes of cultists and summoned Bloatflies, they are unable to prevent the ritual from completing. A shimmering gap in the fabric of reality rips through the scene, on the other side sits a grotesque Greater Unclean One. The massive daemon "donates" some of his saliva into a glass bottle and apparently, that was what the ritual was all about. Meanwhile, the heroes are batteling the Nurgle Champion but before they are able to kill him he casually steps over the edge and plummets into the deep.
In the end, the crew is able to destroy the bottle of drool and witness the Skaven turn tail & run.