As with other Monster Manual supplements, MM5 contains a variety of new creatures as well as expanded variants on staple D&D monsters.
The MM5 was released in July 2007, published in the same format as the Monster Manual IV, featuring lairs and tactics and like III and IV how these new monsters fit into Eberron and Forgotten Realms. According to previews of the Night Below Dungeons & Dragons miniatures set, some of the new monsters that feature in it include the Greenspawn Zealot, the Arcadian Avenger, the Verdant Reaver, and the Carnage Demon.