Manual of Monsters is a source book for Warcraft The Roleplaying Game and was published in 2003. It contains descriptions and game statistics for a large number of creatures that inhabit the Warcraft setting. As the book was published before the release of World of Warcraft, it only covers a few creatures that were introduced in the MMORPG and mostly covers material from the RTS series. Chris Metzen was a co-author and a member of the "Design Assistance and Additional Material" staff for the book.