Wheel of chaos

World has been changed ever since a wheel had appeared in the sky .As the first time wheel rotates human gain mana while weapons became useless and animals became beasts , plant was the first to adapt to mana and evolve into plants that produce mana fruit or absorb nearby beasts as nourishment to produce mana fruit.The second time it opens portal into other worlds and many species such as Demi human,dwarves,elfs,and monsters into earth.The third time wheel rotates to produce dungeon inside earth or outside gate From another planet. The novel starts from 3250 which is after 1200 years where human adapted to changes and evolve after wheel of chaos had appeared meanwhile reasearch had predicted that next time Wheel of Chaos rotates in 18 years and it was confirmed by Demi human, dwarves, elfs that it will be arrival of vampire and demons The elf dwarves Demi human ran away from their own planet to earth because of vampire and demons so races United in protecting the planet but they realised it was too late since many spies and forces came into earth via gates .Our protagonist is a young boy who saw his own father dies in the hands of a vampire . Desiring revenge he wants to get stronger by joining the academy where human and other races train for the upcoming war in 18 years but they have no idea that vampire and demons are the last enemies are someone even stronger are waiting behind them NOTE: MC is a kid in novel so don't expect the kid to be powerful and smart from the start