Chaos

Endless Battlefield, like its name, is an ancient battlefield that keeps going on. By a mysterious force, everyone killed in this place will have their soul stay here and be unable to pass on. 

All they can do is keep fighting with the grudge they have. Weak, strong, human, elves, monsters, beasts, and many more kinds of living beings are entrapped into this place. 

Coincidently, all these restless people also never get tired of fighting and consistently killing each other. Some of them even start to hunt down the living beings that are entering the place. This place is even called pure chaos and hell.

No matter how strong you are, you will perish if being targeted by all these restless souls. They said there is even a stronger being than a seventh-grade combatant and releases destructive energy towards the surroundings.