The Wardens are individuals with arcane knowledge or special talents who are employed as members of the Department of Special Investigations.
The are part scholar, part detactive, and part secret police. [Imagine them as a cross between the FBI, and the Watchers from Buffy]
Their job it is to investigate problems and disturbances that may be arcane in origin or which the local authorities are unable to deal with. In practice, the Wardens get most of the stranger cases.
They carry a specially engraved and marked pocket watch as a symbol of their authority; these watches are faintly echanted so the anyone holding one will feel a tingling sensation, and thus they are difficult to fake.
The Wardens are connected to police, the military, and the arcane colleges.
The headquarters of the Wardens is Warlock Hall