From publisher blurb:
The Darkest Dungeons of Your World Just Got a Little Darker.
This supplement for the Dungeons & Dragons roleplaying game presents more than a hundred monstrous foes to challenge even the toughest player characters, including draconic masterminds, demonic horrors, vengeful fey that haunt ancient ruins, and mind flayers driven mad from their journey beyond the planes. This book also provides powerful, ready-to-play varieties of popular monsters such as the hobgoblin, the kuo-toa, and the vampire, saving Dungeon Masters precious time at the game table.
In addition to scores of new monsters, this tome features sample encounters, easy-to-follow tactics, and guidance for integrating these new creatures into any D&D campaign setting.