I'm been fascinated by the effects of tempering. A Primal tempers/shocks/drowns/etc. someone and they become an extension of the Primal's will, losing their individuality and maybe even their sentience with subsequent temperings, until they become like drones in a Hive Mind of sorts.

And in most hive minds there is always the queen. One who commands the subjects for they are otherwise dormant without her, their free will stripped, their individuality diminished and in the worst cases their sentience destroyed. In this case the Hive Queens are the Primals themselves (Making Garuda and Shiva more literal cases) And maybe Mog.

But I think that a new villain would want the ability to temper others. Do you think that anyone would want to research tempering to gain the ability?