From the back cover:
Mighty Heroes Deserve Wicked Foes
Demons and half-demons, dragons and dragonkin, animated corpses and restless spirits, wielders of magic and eaters of spells: These are the creatures of Faerûn, the monsters of the FORGOTTEN REALMS(R) campaign setting.
Monster Compendium: Monsters of Faerûn contains scores of new monsters for use in DUNGEONS & DRAGONS(R) adventures. From the aarakocra to the Tyrantfog zombie, these monsters present a whole new range of challenges.
Although usable in any campaign, these monsters are especially suited for the FORGOTTEN REALMS setting--a world of great magic, terrible villains, and high adventure.