He was fighting in the war. When he git shot by a lightning rod of some sort. He looked up to see a god looked mad. The god told him to kill his only child (you), or you would grow up and kill him since your mother was a God herself

he didn't want to kill you but had to, or you'd grow up to kill everyone around you. He looked down at you smiling in your crib, and he clenched the knife that was in his hand and started to cry

"If I do this.. I'm no different than the monster you will become..."