The Donnerwald Experiment
A mature dreampunk RPG with German folklore, demons galore, interactive combat mechanics and more!

Positive · 39 reviews
85% positive (33 / 39)









An all-new dark fantasy dungeon-crawling RPG taking inspiration from the fan-favorite Monsters' Den: Book of Dread. Create your party of heroes using an innovative skill system and enter tactical turn-based combat against the enemies of humanity. Loot, optimize, strategize. Enact vengeance.
Released
October 2, 2025
Price
Platforms
Windows
Developer
Publisher
Last sync
September 25, 2026
Monsters' Den: Book of Vengeance is a party-based dungeon crawler with tactical turn-based combat.
Each adventure targets an enemy of humanity, a unique final boss. As you progress through the floors of the dungeon towards your confrontation, you will battle enemies from diverse factions, collect loot and make choices on how to resolve encounters within the dungeon. Build the synergies between your team's skills and equipment to enact final vengeance. Success means unlocking new campaigns and new skill trees to try in your next adventure. If you've grown attached to your party, continue to play and optimise them in the infinite mode.
Taking inspiration from the fan-favourite Book of Dread, the Monsters' Den series returns to its old-school roots in this all-new title.