from the Adventure Overview:
Fortress is set in Robert E. Howard’s mythic Hyboria. PCs start out in the company of notorious Zuagir raider Yafar Al-Wazim. Depending on their moral flexibility, our heroes are either Yafar’s captives or his new, hard-bitten recruits. The group is forced to take shelter at night in an abandoned Mughal-style fort near the Turanian border, after a vicious haboob sandstorm blows across their path. Several raiders know of the fortress’s evil reputation for being haunted, but facing choking death, Yafar orders them through the gates.