Pantheon explains how a wizard does it

The sad reality is that with each passing year it is less likely that a very large man will enter your life to inform you that you are, in fact, a wizard, Harry. Even more so if your name isn't Harry. So perhaps you can console yourself by playing a wizard in Pantheon: Rise of the Fallen, slinging destructive spells left and right and holding on to the last remnants of your dwindling sanity as you do so.

Or perhaps not holding on to those remnants, as one of the class specialties, Frenzy, is specifically for casters who have let themselves go completely bonkers and derive power from that madness. The other specialty, Aspect, allows the wizard to maintain sanity through martial perfection, creating shrouds of mana and summoning duplicates for various functions. Take a look at the full reveal for more details on the lore and mechanics of these casters.

Source: Source: Kickstarter update