Sebo gave you some trinkets to help with the duergar, and you went on your way, returning to Zynth Hole. You made out much better this time, eventually overcoming the duergar and the clerics of the Faceless One. You recovered the Tome of Ages, and a journal which hinted at the clerics’ plot. From the Tome, the clerics had learned how to raise one of the ruined temples of the Faceless One, in the Swamp of the Dead, so that their deity would have a home when he returned. Some of the clerics had started off for the swamp already. At least you can be comforted by the fact that without the tome, this process of raising the temple will take longer.
You also rescued the captured deep gnomes. Sebo thanked you, and rewarded you as well. He also, with his gift of foresight, gave you some warnings. He said he saw people talking about travel in the swamp and the importance of covering your head while in the swamp. He also warned you to beware of someone that you would not otherwise fear. You are now wrapping up your business in Xruesgrim, and ready to return to the upper world.
At least you threw that last avenger at us as a real challenge (and a challenge he was).