In a world of Fantasy,a place where different species/race exist.Dragons,dwarf,elves and many more you wouldn't believe.Human's were regarded as the weakest race,but also as the origin.Any human has the chance to evolve into a higher being when they come into contact with mana.In this modern and fantasized era of earth,the amount of human's residing on earth currently is "1".How did this come to be?,listen closely 500 years ago;
Earth was made up of four empires,Each empire had it own king who ruled over them and each kingdom had an animal they watched over and used as their symbol.The four empires were the North,Eastern,Southern and Western empire.
Cracks appeared in the skies and at many places,among these cracks there were four cracks,big enough for an adult sized human to enter,these four cracks appeared in each of the royal hall of the four empires.For the smaller cracks wherever they appeared the atmosphere and environment there changes,animals go rabbid,some exploded,some animals gain supernatural abilities some also beacame monsters(evolved).
Each empire suffered many casualties leading to a reduce in their population,they also gain abilities.As for the royals,In every empire they were reduced to only 5 members,all the rest died excluding their king.The beast of each kingdom also underwent changes,they awakened their bloodline.
The beast in the north became an ice dragon,the south beacame a golem,the east beacame a fire phoenix and the west became a megalodon.The moment these beast evolved,from the depths of each of the four cracks present in each kingdom,a tower comparable to a 100 story building emerged and the divine beast of each kingdom went and lied on top of these towers.
Suddenly,a loud 'Clang' was heard followed by the earth being covered in a metalic domain,darkness covered the entirety of earth,panic everywhere,then the fire phoenix emitted a loud shriek followed by it body emitting heat illuminating the earth darkness.Then a system panel appeared in the skies,a panel like that of a game.
*EARTH UNDERGOING MANA ASSIMILIATION,CONQUER THE TOWER TO OVERCOME THE DANGERS TO COME,TIME REMAINING:400 YEARS*