 Limbo, the Dream World where Dream Princes create their kingdoms and dream wanderers explore tattered dreams close to Vortex (a place of chaos and creation).The original system is a skill-based system utilizing 20-sided dice (related to the BRP system used by Äventyrsspel for their Drakar och Demoner rpgs), with point-based characters.In the game, a natural 1 usually is great success with added bonuses and a natural 20 means a complete failure.