Tell me of the past

"I remember you said that if I become strong enough you'll tell me everything. So do you think I'm powerful enough now? I want to know more about you and your battle against the ORIGIN. It has been so long and the only things I truly know about you are the bits and pieces I hear from the other incarnations as well as those poor souls that are captured into our soul realm. Yet nobody would tell me the full story, no it seems like no one truly knows the full story... So the one who has been praised as the first hero of humanity what is the purpose of your eternal battle?"