From the introduction: You are a descendant of the greatest vampire hunter of all time, and you continue to fulfill your ancestor's mission. 1857, London. Mists, shadows and superstitions. This game was made using Dominus, a masterless role-playing system. You will find all Dominus rules on this document. You can play "Van Helsing 1857" with a group, with or whithout a master, or you can play It solo, using the TABLES and the narrative structure given.