DA
Let me offer
Nazi Occultist a suggestion on the general idea of an overlord that isn't a Stereotypical Villain yet will commit horrible things:
Redpilled Awakened Mage: Your studies have taught you a sense of right and wrong and truths beneath the veil of lies enveloping all existence that would drive those weak of mind to insanity or cowering to back to the darkness of their previous ignorance, including a terrible realization that entire races in the world were corrupted, their children doomed since birth because of the demonic influences and the only way to help them is by annihilating them. You will not coop yourself up in the tower when there are people that require your help, or a final solution. Once all the corruption is cleansed from the world, the future will be one without suffering and without evil, and a superior, pure and all-good mankind will rise from the ashes.