From the back cover:
In an instant, the city of Lighthall vanishes from you very midst! In its place come five coins of amazing powers - power to transport you to a realm of fantastic worlds and incredible magic. In this realm, islands float in air and vast armies battle at the brink of oblivion. The return of Lighthall depends on the defeat of one man: the evil enchanter, Durhan the Conqueror.
Surrounding himself with the armies of Volde, Durhan musters his strength for the final assault on Trann. Defeating Durhan insures the preservation of Eloysia. Saving Lighthall, however, is another story. Lost in the raging core of the sun, the city balances on the edge of destruction. The rescue of Trann, its Ruling Wizards, and Lighthall itself all depend upon the powers of the coins - and the brave adventurers who take the quest upon themselves.