actually, there are no "urban mages" (almost, except for the obsessed ones). Evil is evil, it only affects the balance and acts in its own interests in any case.
if there's a -1 mage, the next one might even wipe out a town
Added after 1 minute
I agree, let's assume that person is Nera Drake, a troll.
Profanum vulgus et inscium ne attrectato:
Omnesque Astrologi Blenni, Barbari procul sunto
Qui aliter facit, is rite sacer esto