Stones Over Sandpoint

To begin the adventure, the PCs need to return to Sandpoint - probably after being called back by Shalelu. She makes use of the Animal Messenger ritual to contact the party if they're not easily reached. The message she sends is one of urgency: giants may be headed for Sandpoint, they could arrive at any time, and the town is likely doomed without the PCs' intervention.

When the PCs return to the town, give them a short while to effect preparations before springing the raid on them. If they want to be cautious and engage in a little strategic planning, let them. There is no way for them to know that the true target is an unassuming bit of rubble from the Old Light.

Provide the PCs with a level 13 major quest to defend Sandpoint from attack.

Fortress of the Stone Giants

The fourth adventure in the Rise of the Runelords campaign centers almost entirely around a single, fantastical location: the fortress of Jorgenfist and the library that lies beneath it. Not only is this the adventure where the PCs will begin to encounter things truly beyond the ken of mortals, but it's where the overarching plot of the adventure path is revealed, along with the personal introduction of its main villain.

In terms of conversion details, I will design the encounters to bring the party to 16th level by its conclusion. In addition to the normal bestiary conversion, I'll also be creating a few new giant stat blocks to help flesh out what would otherwise be some fairly repetitive encounters. These will appear in the bestiary conversion.