From the introduction:
Long ago, a great wizard named Calizar became tired of the ways of adventuring. Deciding to build a small keep in which to continue his craft, Calizar found a location far from the reaches of civilized mankind. Deep within a mountain pass, surrounded by sheer cliffs, a small keep was constructed. After construction had been completed, Calizar was content to live with his new home without the constant interruption of man.
For 9th - 12th level characters. Distributed as a ZIP archive containing the adventure file, some author's notes, and six PCX image files (maps).