Military action
The Jadeite Empire launched an invasion upon the Old World. Their ships would not only attack the continent from the east but also from the west. Led by dragons, their armies were vast and the kingdoms in the Old World weren't united like the Jade. The conflict would see many kingdoms fallen, millions dead and countless treasures plundered by the invading hordes. Those surviving would band together, forming greater nations to fight against them like the Divine Kingdom, Isagorth and Lepidia. However, even they were unmatched by the ferocity of their new enemies. It wasn't until it rained... sand, that the enemies would retreat.