World history
"You have lost all ancient history?! Hmm... It is indeed not very practical to rely on one person to pass everything on to the next generation, listen up then..." Fugon nodded a few times and then looked seriously at Robin, "We basically don't know the origin of life in this world, our history books only span to around 500,000 years ago, but it's enough to give us everything we need about what's going on around us... So let me start without any further deletions, 500,000 years ago there was no energy cultivation yet, there were only several intelligent races that sometimes fought and sometimes cooperated like any in-race tribes, and there weren't any major issues, as for those races, most of them were branches of the Treant species, they are plants that have mutated and gained intelligence."