From the back cover:
Once upon a time, Chagur the Lich bought a dungeon.
This archetypical Old School setting was born in 1977, But after a decade, role-playing passed it by, evolving to embrace continental campaigns, interwoven ecologies, and lots more. It all got very complicated.
Then the game abruptly change. New School arrives. And many were reminded of the old days and old ways, and the simplicity of the Original fantasy role playing game.
In this new work, Lich Dungeon has arrived! Chagur has risen from the grave of history. But what is his hidden objective, the secret reason for the existence of the Lich Dungeon?