They are currently on Pathfinder #4: Fortress of the Stone Giants and have come to the fortress itself. They have also killed Longtooth and the Wyverns and found a staff that allows them the use of Stone Shape.
A note on these PCs:
When the players saw a huge goblin fortress made of wood, they set it on fire, causing all the goblins to flee from it and onto the bridge which promptly collapsed. That sums up how they think.
So, naturally, when the PCs see a fortress next to a gorge they decide to stone shape it off the cliff (I won't describe how, but I'll just say it worked). Mokmurian and the Harpy monks survived (along with a few others) and are swooping towards the PCs. That is when the session ended.