After resting at the shrine of the Velos, the party decided to double back into the secret door and go back to the other branch, presumably on the lower floor. This passage emerged in a store room.
Emerging from the room, the PCs entered a large chamber with a trash pit. As is always the case in D&D, trash=otyugh, but this one was sleeping. The stealthy members of the party approached to try to kill the otyugh before it awoke.
In short order, a long a complicated battle began. The otyugh was dispatched with relative ease, due to its being surprised while asleep. However, adjacent to the trash room on this floor was a jail, staffed by a ghost jailer. He had powerful attacks that moved people partway into a demi-Ethereal plane with him, and could push people while simultaneously granting them phasing, so he could trap them in jail cells.
The fight ranged around with several people being trapped and freed from different cells, and other excitement, before the party slew the ghost, though he managed to drop Molokhai at the very end.
Searching the cells, the party met Kaalan, one of the Theran delegation they sought. From him, they learned that negotiations between the Therans and Yuan-Ti had broken down, and most of the Therans had been eaten. The Yuan-Ti apparently sought Lictor, a legendary weapon carried by Kaalan’s commander, for their magical experimentations. The party agreed to explore the castle with Kaalan, but planned to jump him and take him back to Throal for questioning later.
Also on this floor, the party found a supply of Theran Augmentation Reagents from the crew of the airship, usable to enhance weapons and armor in a variety of ways.
Then our heroes headed up the stairs and into the main hall they had avoided thus far. Here, they met a yuan-ti abomination torturer, a questor of Dis, and a fang titan (T. rex) skeleton. Fighting, and death, ensued, with the skeleton’s allies brutally savaged in the first few rounds of combat. The questor died having barely participated in the fight, and the torturer fled upstairs. Petr chased down and killed the torturer, while the rest of the party destroyed the skeleton.
As the session ended, the PCs withdrew back downstairs to rest briefly, with plans to continue upward in the castle, seeking more yuan-ti to kill.