The Sea People
Various
Now with this one, things get really mysterious and far more out there. During the Bronze Age, civilizations all over the world were moving forward at an incredibly accelerated rate. New tech was being, we’d discovered fire and advanced cities were being built. We were on a roll. Then 1200 BC happened and it all stopped. Civilizations were wiped out, tech and knowledge was set back a thousand years and we had to start again. The Bronze Age collapse is a mysterious dark space in the history of mankind and no one knows what happened.
There is a theory, however: Sea People. According to some carvings, a mysterious group of sea fairing folk known as the ‘Sea Peoples’ attacked all known civilization and wiped them out, despite being inferior and more primal than we were. Who these sea people were, is something we’ll probably never, ever learn.