High-quality dungeons feature enjoyable boss fights, thrilling challenges, and impressive treasures, the "Where Evil Lives: The MCDM Book of Boss Battles" provides these elements and more, offering immediate resources to manage a lair.

This book is suitable for all levels of play from 2nd to 20th, and it contains 22 dungeons. Each lair includes a distinctive, active boss, all necessary monster stats (151 in total), a tailored treasure hoard with unique rewards, full-color maps, and descriptions of traps and NPCs. The book's stat blocks are from the thoroughly tested bestiary, "Flee, Mortals!", ensuring each foe offers more than just hit points or spells. It also introduces rules for four new creature types: Action-Oriented Creatures for more engaging boss fights, Minions to quickly add variety to encounters, Retainers for easier sidekick management, and Companions for players who enjoy pets