There was a day when muggles and wizards lived in separeted worlds. The world of wizards was peaceful and both wizards and nature lived in harmony. On the other hand, the world of muggles was being gradually destroyed.

As soon as all the wizards had news of how muggles lived, the five most powerful wizards were reunited and, using all their knoledge about magic, they casted a spell so they could open a portal and let muggles get into their world and live with them under one conition: they must respect their land and lifestyle.

Of course at first this was an easy rule, but along the way the hearts of the muggles got greedy and they wanted to steal the teasures and powers from the wizards. That was when they entered in a battle that would only end whenever one of the two sides falls. 

Those five wizards join their forces to cast a curse that would divide that world in two sides so they could live in peace and the muggles would not have any memories about the magic. The price they had to pay to enact that curse was their lifes. So all their powers were gone and they will only return when muggles conceive five people that could restore the peace...