Divide et Impera: Magicae Mathematica, Book 3 (Unabridged‪)‬

A device that can destroy the world has fallen into the hands of the two master wizards who seek to destroy the council and their city. After a terrible event strikes the city, plans are put in motion for a mission to take back the device before Diades discovers its true power. Will they reach the black castle? How will they get past the tribesmen chiefs? A city divided, alliances split, two master wizards set to conquer, and a device of incredible power. If Alex is the missing variable...now what?