From God to Extra: Return of the strongest immortal

Asmodeus was a God, He had a world which he had created and had ruled for centuries. He had created supreme beings who were almost like him to make his ruling easier but with time they became tired of his leadership. They had planned and sealed away their creator, bringing him to ruin. Locked in vast nothingness for over 4 decades Asmodeus had given up on the thought of revenge until he found hope. [Asmodeus the supreme lord locked away in vast nothingness, what a joke!] [I can sense your intense desire for revenge and I am here to give you an opportunity] [If you choose to accept I the system, I can lead you to immortality once again] [Do you accept?] "Yes!" Asmodeus brought with a newfound opportunity was determined to get back his powers. Will he achieve his goals or will he die trying?