Welcome, gamemasters! Calos Book of Monsters is a tome of monsters created for the Mrk Borg roleplaying game, and includes twenty new monsters that may or may not be suitable to your campaign.

In addition to the necessary game statistics and monster descriptions, each of the creatures on the following pages includes an involving the heroes section that suggests ways in which the player characters may encounter/become involved with the monster. As with everything included in this book, these are simply ideas that you should twist, warp, rewrite, and adapt to suit the needs of your campaign.