During World War 2, the Ahnenerbe project was formed to hunt for and research the archaeological and cultural history of the Aryan race. However, instead they found other races; Vampires, Werewolves, Goblins and Trolls. They bribed or enslaved these races to fight for them, unleashing them against the disbelieving Allies. Soon, all sides conscripted these other races and the public gradually became aware that they were not alone in the world.
After the fall of the Third Reich, thirty countries signed a treaty to protect these new races and give them rights so recently reserved for humans. These nations then formed the ‘Grand Alliance’, a council that would govern all matters of the supernatural. Each country put forward a council member as well as inviting the other races to nominate their own.
Their first act was to establish ‘the Guild’, the police force they would use to investigate, contain and, sometimes, eliminate supernatural threats to the world. They also elected a ‘Guild Master’ to organise the running of the new organization.
After 60 years, most of humanity has reverted back to denying the presence of monsters and ghouls straight from the pages of horror, which suits the Guild just fine. They operate in the shadows, hunting down rogue creatures and enforcing the laws implemented by the Grand Alliance.