The Tranquil are a group of mages who went through the Rite of Tranquility and belong to the Formari. The Rite cuts off the connection to the Fade, and the Tranquil can no longer dream nor draw on the Fade to perform magic. As a side effect, their emotional center is utterly removed, which makes them undesirable to be possessed by demons in the first place. It should be noted that until 9:40 Dragon, the tranquil were thought to be immune to demonic possession.