Kingdom Hearts' Keyblade War Explained

"The Keyblade War narrative conflict has been a driving force of the Kingdom Hearts series' lore and story. The main antagonist, Xehanort, is obsessed with the legend; Details about what really happened are quite confusing, as its events happened long before the events of the Kingdom Hearts series. It's not even mentioned in the first game, let alone a decent number of the other sequels, but still remains very important to the series' overarching story." - click image for article