Stampede by Moonlight

Publisher's description: A single session combat and roleplaying encounter suitable for four characters of 5th-7th level using the d20 v3.5 ruleset. The shade of the arid canyons is the only respite from the hot desert sun, and travellers often use the welcome shade when travelling through the borders of this hot, dry region. But there are dangers to it, of course. A few unlucky and careless travellers find themselves stuck deep within these chasms, unable to escape approaching danger - and danger can take many and varied forms in this lawless land...