Kerker, from the German word for “dungeon,” is a medieval dark fantasy tabletop RPG with a touch of acidic humor, built on the classic foundations of Old School Essentials. The project was born from the desire to reinterpret a traditional style of play, preserving its collaborative essence while developing an identity of its own. Written by Arthur Vinícius, Kerker offers an experience centered on exploration, dungeons, risk, and reward. Rather than guiding players through a closed narrative, the system values initiative, improvisation, and character interpretation, creating situations where each choice can open the way to triumph or condemn the group to ruin.