1000 years ago ...In the kingdom of arthedia's forbidden library lies a shelf full of locked books of prophecies, in that shelf there is one particular book of prophecy about the coming chaos...
it is about when the demon kings descend to bring chaos and suffering to the world of KEDAL, he will end the war between the humans and other species for all species will collide to defeat the demon king... the war will last for centuries... but... their effort is all in vain...the demon king will get stronger and stronger because of the none ending sheds of blood... not until... a hero in a full knight armor in the prophecy appears and defeat the demon king and after the war is over the hero's existence will bring unending peace and prosperity to the whole world.
to prevent that prophecy from shedding, the most powerful mages 1000 years ago made a mana core that sets a barrier when the core is activated if it gets broken.
they set it up in every continent and all mages are gathered around the world every 6 years to strengthen the barrier, even until now
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ARTHEDIA- The kingdom where human lives
KEDAL- the name of the world they living in ( us is earth )