“Monolith Mansion” is a game companion to the fictional game of the same name. In other words, it is a sort of companion book that provides readers and players with additional information and clues about the gameplay.

The eccentric entrepreneur Eustace Lacron invites you to help him rid his estate of beasts. Anyone who eliminates a beast and brings back proof is to receive a reward. Players can choose between three characters with different personalities and ambitions to climb the tower.

The book comprises five chapters, which illustrate and explain the four sections of the tower, the Garden, the Lobby, the Chambers and the Reservoir as well as the rules of the game, locations, character abilities and the characteristics of the beasts.