"Flee, Mortals! The MCDM Monster Book" is an epic 5e monster book with 339 stat blocks and new rules for action-oriented creatures, minions, companions, and encounter-building.

The book offers more options and unique abilities for classic monsters like goblins, hobgoblins, and dragons, making them more engaging and fun to use.

The new monsters are designed with specific environments in mind, such as swamps, cities, graveyards, and sewers, for easy integration into adventures.

The book introduces minion rules for epic, cinematic encounters, allowing players to feel heroic by fighting a horde of enemies without slowing down the game.

New companion rules allow players to have a cool companion, and retainer rules provide a simplified way to manage NPCs.