After losing interest in a world of work, salary man, accountant, jobs and slaves to money, the gods decided to create a world where all sorts of creatures and animals could use magic, a power that only the gods know.
At first, it was magical. Dragons and pegasi flying through the air, packs of Fenris hunting in deep forests and animals living in harmony. Soon, animals evolved into beastkins and they continued to build civilizations. Same occurrence happened throughout the nine continents. But when there is hope and happiness, there is always sadness and despair as there is no perfect world.
These emotions alone were enough to sow seeds of evil into their world. And demons began to grow using the natural mana flowing through the air and in the soils. The demons appear in the form of animals, insects and humanoid forms and they were a force of destruction to be reckoned with.
The gods can no longer ignore the massacres and pleas for help, so they created the elves who are born from nature's mana. That gives them a longer life span and more connection to the magic that flows through this world and light magic which are demons' weaknesses. Dwarfs who are birthed from the intelligence of the world provides weapons for people to protect themselves. Humans from their own images, used their gift of intelligence and magic to lead the soldiers of this world to defeat the demon king, Goddosureiyā, who has united the demons.
In this war there were six unique individuals who were able to go toe to toe with the Demon King, they were later known as the 6 heroes.
But, no matter how strong the soldiers or heroes are, they couldn't kill the demon king. So they drove him to the smallest continent, the 1st continent, and trapped him using a barrier magic to isolate the demon king from the rest of the world. This continent is later named, the Demon Isle.
In order to prevent another demon outbreak, the gods created dungeon cores to concentrate and convert the negative emotions and natural mana into premature born demons so they are not as powerful, in addition, the dungeon cores can only generate a specific type of monsters so they are further weakened. Each dungeon core is protected by a dungeon so they cannot be easily destroyed. The dungeon also to serves to keep the demons and monsters inside. The dungeon lord is the master of the dungeon and it is the master's duty to protect the dungeon at all costs, chose the type of monster to create and to control the generated monsters.
The 9 tailed foxes(one tailed fox, two tailed fox… nine tailed fox) are created to oversee the dungeons and distribute the mana in the nine continents they rest in. Each tailed foxes are to govern a continent and the one tailed fox is given the duty to monitor the Demon Isle and report its activities every decade.
The titles of the Ancient Dragons are awarded to 7 dragons who fought outstandingly against the Demon King(Fire dragon king, Water dragon king, Wind dragon Queen, Earth dragon king, Light dragon king, Shadow dragon King and Dragon King of Space & Time) they were given the responsibility to keep the 7 elements of the world in check.
This is the end of the era of beasts and the beginning of a new golden age of magic.