Besides, even if you're using Demons, they're more convenient when you've modified them yourself!
For one thing, the power gained from burning away their life force was completely different.
Furthermore, though few Wizards of the Demon Dominator faction took it seriously, this school of magic had a minor flaw that still had an impact—the Abyssal Will!
The Abyssal Will, the only "public bus" among the countless great Existences in the Boundless Void!
The entity was like a garbage can of the Void. It would take anything and could do something creative with whatever it got.
But even so, the Demon Dominators' practice of taking endlessly without giving anything back would earn the resentment of even an entity as "magnanimous" as the Abyssal Will. This manifested in a few ways: the more Demons that died in vain, the greater the initial Magic Power cost to summon them. At the same time, the difficulty of dominating them would also increase.
