Did the humans come and attack the monsters..? You didn't kill them, you never killed the monsters. Something being "Stupid" is an opinion. I've never heard about a skeleton village either. Where in the waterfall area are we? Do you have anything to do with the war between monsters and humans? I bet this world is not our consequence, but yours. I assume this is punishment for us having fun? For us trying to push people off the edge? For us trying to cause pain for others.