You dont need to be a genius to understand that when you destroy the world in the past, the world is gone in the future. So that's how the evil trio thought. Since they weren't humans from this planet, and they can breathe in space, they didnt give a * about this world. However, they couldn't destroy the world without getting enough magic/power/mana. They have gained acces to 8 different time eras in Gaia; Arise-Of-The-World (the year the world was born), PrepreHistory, Prehistory, Ice Time, Classic Ages, Middle Ages, Present and Future. In each time era, except the first one, they put 4 well-hidden artifacts. These artifacts weren't just dumb things, they were objects drawing all the mana in the area from every time & place they were in. The Evil Trio has settled in the Arise Of The World, waiting for the artifacts to be done with drawing power.