Remnants of a time long passed (rwby x male batman beyond reader)

Let me ask you a question. what's your favorite fairytale. is it red riding hood. or maybe it's godilocks and the 3 bears. maybe you like snow white. or maybe you like Beaty and the beast. we all know the age old story about beacon academy and team rwby being formed.....but what if I told you that there was more to the story. what if I told you that there were once gods that walked amongst us what if I told you that before the term huntsmen was formed other legends walked amongst the people. there was the man of steel who could fly and shoot concentrated heat blasts from his eyes. there was the fastest man alive. there was the Amazon princess. and finally....there was the most legendary one of all. the dark knight. the batman. now if you asked people today they would say that these heros were myths. but very very few people knew the truth.....the truth was that the heros of old died saving the earth from Darkseid. but in the process....they died. so what happens when y/n l/n stumbles across an old beaten down manner on the edge of vale. what happens when he discovers the batcave of myth. what happens when a new batman rises from the ashes of the old.