As young Alexander was sent to magic Academy his siblings paid for everything that way he had nothing to worry about and was fully taken care of. Unfortunately this soon became a family tradition where the descendants that were talented were put into powerful positions that best suited them while the rejected descendants were sent away to Magic Academy nurse school black Smith schools magic engineering science lessons etc. These were the normal for nearly twenty thousand years before a new type of monster was created. That monster was extremely destructive due to it's tremendous physical abilities which allowed it to conquer entire nations with it's might as well as it's energy. At that time energy stamina mana and all other forms of energy were limited which forced everyone to be wary about how much power they use and the drain it would cause as these types of energy were difficult to recover however that monster had no problem with that as it's energy was tremendous and recovered quickly. Just one of those monsters would be enough to destroy small countries however a individual controlled two thousand of them giving them more than enough power to wipe out the entire world. "This is another confusing part so please pay attention" At that time in another world parallel to Earth a individual died and was reincarnated into our world with a video game like ability allowing them to level up. This individual used this system to become an unbeatable warrior by utilizing their tremendous energy reserves and recovery rate which was ten times that of normal people before they discovered a reservoir of untapped energy that was accumulated since the mythical era.