Back before the world was thrown into chaos people lived normal lives but something hit the sun causing a supernova. Humans disappeared for millions of years and when they and when they came back they had no idea what happened.
They tried to survive but that was almost impossible since the monster infested world they where in now. Over the next 100 years humanity develop into five different factions. The people who used the technology as a force to fight the monsters.Then we got mages or sorcerers or whatever name they use but the only thing the matters is they use a force called mana to do many things like create a ball of fire or even cause a earthquake. We also have beast tamers who learned to connect to beast and live with them. We also had the people who prayed to gain their powers or those whose where chosen by a higher deity. Finally we have my faction the people who have evolved specific powers and live in a society like those in the old worlds comic books.
After they gained these abilities over the span of 1000 years the world gained more order as they set up towns they shortly after cities and they eventually countries. They have learned many things since like how they are no longer on earth but a new planet they called Gaia but the something still puzzles them. That thing is what happened when they disappeared and what caused it.