From the publishers website
For a year leading up to the release of Ptolus, game designer Monte Cook wrote a short article every week and posted it on a website just for customers who had preordered the book. The articles were brand-new material for the city: NPCs, deities, locations, creatures, and similar things relevant to the members of the Delver's Guild organization in Ptolus.
We called this website "the Delver's Guild," as the site brought fans of Ptolus together to discover new resources just as its namesake organization did for adventurers. And now, long after the debut of Ptolus, the Secrets of the Delver's Guild are finally revealed!
In these pages you'll find all the material from the Delver's Guild website just waiting to be introduced to your Ptolus Campaign. Here's what's inside:
6 new gods
12 new locales
24 new NPCs
Plus new monsters, items, treasures, and more!