Close enough Cordy. They mention something several times as to wondering why the people broke the crystal, and it was to stop something they were afraid of. And at the end, when Kuja went back in time to destroy the crystal at the beginning of time, Necron says that Kuja's willingness to destroy everything and wipe out existence in it's entirety because he doesn't want to die alone was all the proof he needed to resurrect himself and kill all the living. That was the point of Necron. Necron was the essence of death. When Kuja uses Ultima at the end of his boss fight, he leaves the party on the edge of death, and while they teeter on the edge, they fight off Necron. The theme of FFXI is life and how all the characters had a different view on how life should be lived. And appropriately, the end of life is death, and Necron was the embodiment. I just replayed IX in January. So... I'm still pretty familiar with everything analyze and dissect the story if someone wants me to do it.