Prolouge
500 years ago, large gates appeared in the East. It spouts out inhuman creatures. Demons as we call them. They were stronger, faster and more viscous than your average monster. Due to their thick armor-like skin, normal weapons like spear and swords cannot penetrate through.
Catapults and cannons were a good weapon, but they were too heavy to be carried around as gates spew out all over the East. Soon, they became obsolete as the demons adapted and dodged the upcoming attacks from cannons and catapults.
Humanity was driven to the corner, demons got to the center of the continent. But something came along the demons, the discovery of mana and it's uses. Archniv Magues discovered how to use mana from gathering of the ethnic people who were driven out of the forest by the demons. Through their folklores, Archniv proposed the theory of mana and few years later. The first magician, Krill Magues, son of Archniv Magues, lead the revolutionary army to eradicate the demons from their land.
Magicians appeared here and there afterwards. Humanity was at it's peak, the gates of the abyss were contained. The demons were repelled and fell back to where they came from.
But the devils came, they were stronger than average demons and able to use magic better than humans at that time. Alongside them, the 7 Devils.
To battle the 7 devils came the 13 Heroes. But the devils was stronger than they thought. 6 heroes died alongside 3 of the devils. The remaining heroes sealed the 3 devils by sacrificing their life. The last of the 7 Devils retreated to the gate.
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The world was split to two, between demons and humans. The greatest magicians were at the frontlines against the swarm of demons lead by the escaped Devil. The war lasted more than a decade.
After years of war, the first Archmage, Grant Magues, the son of the first magician. He was at the peak of humanity's magicians, he lead the war alongside the Sword King Alexander and fought the demons to death.
As they defeat the last of the devil, it spoke
"We shall come back humans. And when we became one, the king shall wreak havoc to this world!"
It's head was cut down before it spews more nonsense by the Sword King.
They were victorious at last, Humanity was able to repel the demons from their land. After 97 years of war against the demons, humanity won. The demons never stopped coming out of the gates but humanity stood strong and remained at top.
Humans became stronger as time passed, 400 years later, 4 Archmages passed. Earth was divided to 4 nations, the impenetrable fortress, Swell Kingdom at the North, the Izaeric Kingdom with it's rich alchemy technologies at East, the barbaric kingdom of Ertia at the south. At the center of these three kingdoms lies the Magues empire with their 3 Archmages.
There's more places that are not considered nations but rather, their own states. The Royal Stronghold that is a gigantic wall containing and seperating the demons from the rest of the world. The Mercenary Guild doing quests for people in exchange for money.
And lastly the two greatest magic schools in Earth. Magues Academy in the Magues Empire and Chanterelle Academy in the mountains between the Swell and Magues Empire. Both schools produce various amounts of strong magicians each year. Both fought against which is better, and Chanterelle has been losing these past few years against other powerhouse schools. Until a certain student showed up.
This is when the infamous blue-eyed magician singlehandedly crushed the strongest-known student, Nicolas Magues Hevrion II, the son of Archmage Francis la Tierre Magues Hevrion of the empire.