Sequential Civilization of Online Games

Each system is unique and incompatible! Just like there will be no demons in heaven and no angels in hell! But if someone could integrate all systems into a civilization, how brilliant* would this civilization be? Demons, angels, mechas, behemoths! Zombies, chi, runes, potions! Totems, elves, magic, sacred tools! Hades, wonders, super powers, stealing demons! Wait wait wait Let us wait and see! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.