Source and Calamity

In the war between gods and demons 333 years ago, both the Holy King and the Demon King suffered losses. The Holy King pinned his strength and hope on the heirs who would inherit his bloodline, while the Demon King brought his strength and ambition into reincarnation. Who would have known that 333 years later, it would be the same person who inherited these powers? ! ! What should I do if I am too strong✧٩(ˊωˋ*)و✧