I want to make a wizard supremacist CYOA.
Basically agnosticism with God is gone, and now the earth is ripe for the picking.
The old alliance of mages is breaking down and war is coming both for control of the earth and to steal the magical secrets of your enemies.
Basically Ars Magica but god is dead there are still some renmants of the divine and the Order of Hermes has broked down as war between houses is inevitabble.