A City of Philosophers with Clubs

From the introduction: Unbeknown to anyone, the city has been the field of a metaphysical battle that could lead to nothing less than its entire displacement to another plane of existence. Each alignment will try to influence people to become the prevailing philosophy. To further their goal, each has an avatar in a position of power. Will the PCs join one of these factions or will they free the city from this fearful fate?