Secreteers are part of a group called the Clandestine Order. They have memory, shadow, and teleportation powers and protect the Imagine Nation and hide it from the outside world. They live in the borough of Cognito.
Hypnova is a Secreteer and helps Jack.
Oblivia is the Leader of the Clandestine Order.
Obscuro is infected by the Rustov.
Tabula Rasa, Jack's mother, was a member of the Order.