Ok, so it seems the monsters are too strong and they need the help of the age of myth to combat against it.
I wonder if it could be written to somehow be the MC's """fault."""
Since he's OP as hell maybe the monsters got stronger to tip the scale¿ But since humanity's strength is concentrated to only him and he does the bare minimum, everywhere else is f*cked. That would be interesting.
I mean, he did 1v1 the avatar of death... SURELY you aren't just given that level of power for free.