Fresh from their successes in Escadar, the heroes bring their traveling circus to the Isle of Kortos, the so-called "Starstone Isle" at the heart of the Inner Sea. As their circus tours the farming communities in the breadbasket known as the "Swardlands", the heroes get a chance to explore the three aeon towers that impart enchanted bounty to the land. Yet all is not well in the Swardlands, as ecological damage and raiding beasts threaten the hardworking farmers and loggers. The heroes must overcome the aeon towers' stony guardians, entrenched Xulgath hordes, and a zealous Dero murderer before they can confront the Xulgaths' alchemist leader and disrupt his disastrous scheme to use the aeon towers to bring ruin to everyone on the island!