Nine Vast Origin Sea Realm... As the name says, there are nine vast origin seas in this realm for a martial warrior to cultivate.
A Chaos Overlord Saint has to transform their Chaos Divine Sea into a Vast Origin Sea in order to become a Nine Vast Origin Sea Realm warrior. With this step, a martial warrior steps into the First Stage of the Nine Vast Origin Sea Realm.
After that, a martial warrior has to cultivate their Vast Origin Sea and let it grow. The vaster an Origin Sea, the stronger a warrior will be. At a certain point, the Vast Origin Sea completely matures and starts going through a special metamorphosis and shifts its position a layer below, leaving the original position empty.
At the original position, a martial warrior could start nurturing a second Vast Origin Sea. And that is how they step into the Second Stage of the Nine Vast Origin Sea Realm.