A World of Xoth Adventure
From the introduction:
Two thousand years have passed since the hordes of Sheng, led by the Demonic Warlord known as the Ragged King, swarmed over the northern borders of Elder Kuth. The northernmost outpost of that ancient land was Akharon, 'the Maiden City', so called because it's defences had never been breached.
The siege of Akharon has long been forgotten by most mortal men, yet it's repercussions echo down through the ages. The stubborn defence of the city bought time for the Giant Kings to bring their power to bear and to drown both Akharon and it's besiegers in a deluge of sand.
Now, time and the desert winds have conspired to reveal the ancient ruins and release the terrible power trapped within it's crumbling shell. The player characters find themselves in mortal danger on the road between Zul Bazzir and Dipur as the shadow of the Ragged King falls once more across the land.