In this adventure, the PCs find themselves in Urik, perhaps as a result of the war between Tyr and Urik that took place in Road to Urik. There, they become involved in a ritual meant to help a nascent Avangion (a very powerful wizard/psion of a generally benign type) reach the next stage of its development, but the ritual is interrupted by Urik's templars. The Avangion-to-be is left in a cocoon, and the PCs are tasked with bringing it to a new location in the wilderness where the ritual can be completed. They need to get the cocoon to the ritual location before it's too late, while evading pursuit as well as dealing with any wilderness dangers on the way, plus the evil machinations of a raiding tribe seeking the wizard for their own dark purposes. The adventure is fairly rail-roaded with a series of set encounters between points A and B. Like other Dark Sun adventures, it comes with a set of handouts. Unlike the previous adventures in the series, Arcane Shadows is not tied to the Prism Pentad novel series, nor is it really tied to the previous adventures. You can easily play it as a stand-alone without affecting the earlier ones.