“Mickies” is street slang for the Michaelites, representatives of the Order of St Michael. Originally a part of the Megalan Inquisition, they’ve since evolved into a body with more of a law enforcement role.
In Cardiel, they’re a secular organisation (employing both Christians and Muslims), charged with administering the Prince’s Justice and maintaining the security of the realm. In Megalos, they perform a similar role for the Emperor, but also retain their original mission as defenders of the faith and destroyers of heresy.
They traditionally work in teams of five. In Cardiel (and Caithness), this is known as a “Hand of Michael”. In Megalos, the name is “Fist of Michael”.