Rules for Using Other Demon Lords Beforehand in the Game

There are other Demon Lords, and you can purchase them with hourglasses. You can also rent them for a trial. Each Demon Lord has unique abilities. The important thing here is that since they are different from the basic Demon Lord, their operational abilities also differ. It's recommended to use them after accumulating a lot of points with the basic Demon Lord in the early game to significantly increase your stats. This will make the game easier.