Zetta's netherworld will not b created at once. Instead it will be built little by little. Players will have to look out for enemies that will try to ruin your kingdom.
This part of the game is mainly character interaction and the story telling.
Here players will prepare for battle by creating new characters, building up facilities, and modifiing their vehicles.
During the event scene you would check out the interaction between the various overlords and Zetta.
The battle phase is obviously for battling out with enemies. Here you want to go out kill enemies and conquer their lands.