Diabolist

Diabolists are arcane spellcasters that harness the powers of demons. They can summon the same demons to act as their servants, as well as using their powers to cause disease, poison, and arcane damage. Upon reaching level 15, A Diabolist can choose to become a Deva or a Stygian Invoker.

Devas forgo their ability to summon demons to instead become more adept in the use of their power and increase the damage dealt by their own spells and abilities.

Stygian Invokers are the inverse, focusing more on summoning increasingly powerful demons rather than their own arcane abilities.