Undead: A Reference Work on the Land of the Undead is set in the land of Verdaise, a bubbling caldera populated by the undead and ruled by the Lich Lords. The book describes the terrain, flora & fauna, inhabitants, and magic of Verdaise, as well as a look at the rebel dwarven Bzontras. Also contains a full-length adventure, "The Brooding Dragon." Part of the Role Aids line of Advanced Dungeons & Dragons-compatible products. From the back cover:

THE LICHLORDS ROSE TO POWER AS THE LAND FELL TO THEIR ARMIES.

As molten fire spewed forth from the fissures of the earth, the Lichlords' leader Nightbay send hordes of his skeletal legions over the blasted lands. He would claim ths place and the dwarves that inhabit it for his own evil rule.

Travel through these vast lands and battle Nightbay's armies!

Undead is a reference work that includes an adventure for 4—6 Player Characters of Skill levels 6–9.