08-11-2016, 12:29 AM
I think the Seanchan took over the world and destroyed the White Tower over the first couple of hundred years after the sealing of the Dark One's prison. But the empire couldn't hold together and within a few hundred years it began to break up, and some channelers rebelled, so you began seeing provinces captured and controlled by rival factions of channelers. Without any group that moderated or controlled them, they grew more powerful and used their power to fight each other in order to amass more power until they ascended into total dominance over the normal folk.