1 : A Destroyed World

In a faraway void, there is a planet. a big planet with nearly 12x times of the Earth's diameter. 

Within it, life thrives because of the planet's atmosphere contains energy called 'Mana'. From titanic worms until Gargantua dragons. From man-eating grass until exploding trees. From Humans until Demons. They all live breathing air containing mana. 

They utilized the energy as much as they liked. They waged wars across the world because of their own 'superiority'. They destroyed countless cities, hundreds of islands, and 3 continents. 

Because of that, the world fell... sick.

Every living being using mana will produce entirely different energy. This energy is the embodiment of chaos. They cant be processed, they cant be used, they cant be recycled. They are corrosive in nature and it will be dangerous for a living being if they breathed a large portion of it. They named this energy 'Chaos Energy'. After the wars, the world has accumulated a large portion of it. It spreads like a disease until it replaced the mana in the planet's atmosphere by 68%. This condition pushes many living beings onto oblivion, but with great determination, they stopped their habit of using mana as they liked. Because of that a few species still continue existing.

Those few species are Human, Demi-Human, Demon, Demi-Demon, Dwarf, Elf and Demi-God.

The human has 5 Kingdoms and 2 Empires they were located at the main Continent called Paradise, this continent is the least affected by the Chaos Disaster. Humans and Demi-Humans have a great relationship and they have been co-existed for a long time. So everyone always categorized them as one species, 'The Human Kind'.

The Demons has 1 Empire and 6 Kingdoms. They have one emperor who ruled every demon in the world, They called him 'The Supreme Emperor'. The demon is not a bloodthirsty species, rather they are a kind species. Even though they are kind it doesn't mean their relative the Demi-Demon kind too. The Demi-Demon is a cruel species who enjoyed destruction. They breath Chaos Energy even though they know it will destroy them, many called them insane as they tend to self-destruct their bodies with a pleasured expression in their faces. They are maniacs, they are 'Devils'.

The Dwarf and Elf lived in the same continent and have a really good relationship, they are a great combo duo. One is good with weapons and the other one is good with magic and science. They have 1 Kingdom, named as 'United Race'. They are undoubtedly the strongest kingdom in the world. Thank the auth- I mean the heaven they were a good bunch.

Many wondered why the demon and the dwarf-elf continent doesn't have a name. It's because they only have one Kingdom or empire. So Continent Name equals Kingdom/Empire name.

Today they lived a normal day. They happy be happy, the sad be sad, the griefed be griefing, the angry be angry, the mad be mad. It's pretty much a normal day.

Well, not until they spotted a few meteor-like objects drawing near their world. They thought the god is angry and decided to destroy the world.

Ah what a peaceful world with poisonous energy everywhere.