The legend of the Night Stalker is that it will take victims from the streets on moonless nights, and they will never be seen again.
The Travelling Oasis, the stories tell, is a gift of Khonsu; god of travellers and the moon. It appears only to those beloved of Khonsu who most desperately need it, and then only for a single night.
A thousand years ago the archmage Martek defeated a terrible evil that was ravaging the Raurin Empire. He left a final prophecy: in a thousand years the evil would return, and must be defeated by a band of heroes.