A loose thread week 1

Adventurers were hired by Chromia, a native of Centralia to help her retrieve a tome she had worked on in the past. She says that it is in the hands of Bonehart, a lich somewhere in Centralia's undercity. This is only week 1 of a few, so progress was slow. They met at the Dragons Pizza Parlor, and afterwards spent a few days trying to figure out how to get to the undercity and where the lich's lair might be.