Hero? Hunter? Nah, I'm the Mailman Bitch (Fallout New Vegas X RWBY/MHA)

(All pictures and some references aren't mine, CTTO)

Year 21**, quirks began to manifest all over the world and created a society where heroes and villains exist.

Year 22**, the two brother gods appeared before humanity and created lands called Remnant. Magic existed before some madwoman went dark. Magic was then forgotten after they manifested "Aura".

Year 23**, The villains waged war against the heroes. A dark being named Salem almost took over lands of Remnant. Peace between heroes and hunters is just one insult away.

Year 2399, The brother gods had no choice but to send them close to extinction with mutations from exposure to excessive amounts of radiation.

Even in the far future, whether pre or post-apocalytic, war never changes.