The Dark Necropolis

From the introduction:

The Dark Necropolis is a strange jumble of rooms and corridors, almost as if it is random. The place seems like a prison on one hand and tombs on the other, which can be baffling without knowing the history of the place. And it is a very, very old history. In the early years the elves took control of the lands, thousands of years before the humans fought for freedom, a great sorcerer king whose name is lost in antiquity lived.