His Dark Materials, a BBC drama filmed in Oxford and based on the University, tells the story of a young girl named Lyra, an orphan living with the scholars at Jordan College, Oxford, in a world governed by the Magisterium, a religious and political body. Lyra discovers a dangerous secret that involves Lord Asriel and Marisa Coulter and is the subject of a witches' prophecy that she will change the world. Cloud pine is an essential ingredient to a witch's power and is a type of tree with magical properties that grows in their world and allows them to fly.