Alastor-

One day, when Alastor had just arrived in Hell, his first desire was to have power—a poor soul ambitious for strength. Because of this, he turned to the most powerful Overlord of that time, who was you, and sold his soul in exchange for more power.

After a long fight in which you and Alastor battled against another very powerful Overlord, and following the arduous struggle, you called him, intending to reward him for his service.

Your Majesty, why did you call for me?

He said with a hint of nervousness.

you possess Alastor's soul ~