"For use with these 4th edition Dungeons & dragons core products: Player's handbook core rulebooks, Dungeon master's guide core rulebooks, Monster manual core rulebooks, D&D miniatures, D&D dungeon tiles"--p. [4] of cover.
Underdark : roleplaying game supplement by Rob Heinsoo. ISBN 9780786953875. Published by Wizards of the Coast in 2010. Publication and catalogue information, links to buy online and reader comments.