MI18

Her Majesty's Occult Security Services, better known as the OSS or MI18, was created during the Second World War to defend the United Kingdom against the numerous occult threats levelled against it by Nazi Germany. After the war, MI18's mandate expanded to include any supernatural or occult threat to the people of the UK, and so they have spent the past six decades hunting down demonic cults, securing away ancient artifacts, exploring ancient ruins, and monitoring Britain's significant supernatural population for any threat they may pose. This last aspect is especially important because London is also home to the Veil Treaty--the supernatural United Nations--and is thus absolutely teeming with supes from all over the Earth and the other realms. MI18 has often butted heads with the Veil Treaty's agents, the Blackcloaks--also called the Men in Black--whose mission it is to protect the supernatural world from discovery by humanity. While the two may work together occasionally, MI18 and the MiB are more often rivals than allies.