I'm running an Echo Wood campaign using Thornkeep and the Emerald Spire and there is not a dedicated thread that non-PFS GMs are allowed to use. I've literally been told not to post in PFS threads, so I may as well start a thread here.
My players started the campaign ostensibly with the desire to enter the Emerald Spire and explore it in its fullest. To that end, they had to gain the permission of the Hellknights in Ft.Inevitable, as the site is restricted due to it being a source of unending evil. They accepted a mission from the Hellknights to capture Krenar Half-Face, a Numerian Alchemist.
Krenar is currently hiding out in the Forgotten Laboratory beneath Thornkeep. The Hellknights reveal that he has been a thorn in their side and that they do not have the resources to track him down whilst maintaining law and order along the Crusader Road.
In the actual module, there is little to no motivation or backstory provided for Krenar. The design of the level is nice, but I had to modify a few things to make it more appealing to a group of seasoned Pathfinder players who've seen everything over the years.
In the following posts, I'll add some of my changes and additions to the module.