The First Collapse

Sometime thousands and thousands of years before the events of the campaign, Centaria and Sedna became at odds due to an unknown event. Following this, the two fought in a powerful battle that shook the world and the planes. Afterwards, the two split into the Aspects of Creation and the Aspects of Humanity, with the Aspects of the Elements forming from the intense trauma the planes went under. Despite their assumed deaths, Centaria and Sam lived, now weakened.

Ramifications
Due to the overwhelming power of the battle, the once whole continents were split, and any other landmasses around Usma and Ithos were drowned or pushed away by tidal waves and accelerated moving of the continental plates. The planes were also effected, becoming more chaotic and closer together, allowing the boundaries between planes to be ripped open from time to time.