The Chaos Expansion Wars was the war that turned the Chaos from a small island to a legendary empire.
Medusa , queen of Chaos, decided to expand the Chaos by attacking the Clubwrath territory called "the Gate to Medusa`s Capital" where they killed all Clubwraths .They also trained Marrowkais , which are sort of like liches.
They then attacked the Crawlers and killed the good and bribed the bad. Next they attacked Riotia, a philosophical nation not knowing about wars and turned them into Deads. They then subdued Dissentia, another peaceful nation and mutated them into Eclipsors .Finally they attacked the Great Knights. They turned the bad into Juggerknights, and exterminated the good.