The return of the calamity

Millions of years ago when remnant young a forgotten general known simply as demise was the right hand man of Salem until he was betrayed by her and left for dead in the land of darkness so Salem and the rest of her forces rebelled against the gods. Eventually he realized he was surely and dying began to cursed his former ruler and soon he saw a slim piece of hope in front of him. It was the legendary hero Ozma and He asked for help and ozma stabbed him the chest and demise soon died but not also before cursing ozma as well and now millions of years later. A mysterious child ends up on the doorstep of a family but something dark lays dormant within the boy.

I own nothing. Spoilers for age of calamity