The Watchful Order of Magists and Protectors
Expect to be questioned at the gate, or when you register with a magister, regarding your ability to cast arcane magic. Wizards, sorcerers, and other arcane spellcasters who intend to stay in Waterdeep for any length of time are required to register with the city, and will be strongly encouraged to join the Watchful Order of Magists and Protectors, headed by the Blackstaff.
Members of the Watchful Order are expected to render service to the city when called upon, acting as temporary members of the City Watch or City Guard. Their expertise often helps investigators determine whether magic was used to commit a crime in the city. Members can also expect to be tapped for assistance during and after fires, natural events that cause multiple casualties, or other nonmagical disasters.
Members of the Watchful order form a more or less sociable association in the city, working together to keep an eye on any spellcasters who opt not to join their guild. Any havoc caused by a spellcaster in Waterdeep risks drawing the wrath of the Lords of Waterdeep — so it behooves the Watchful order to watch all its members.