A professional degree is generally a college degree that allows you to work in a certain profession. There are some types of employment that are not open to people without a professional degree. professional degree is a particularly vacuous designation, one that is designed effectively to impress people in a society that holds official designations of all types to be mandatory for survival.
Definition of mist net. : a finely woven large mesh net erected to entangle and capture birds or bats in flight.
Although the Mists are part of the mythology of Barovia, they may be a means of travel both to and from this location within the Nexus. Moreover, Astinus seemed to indicate Strahd's usage of the mists as a means to breach from the Inner Nexus into Sigil.