Originally Posted by
Kawaii Ryűkishi
Not that Zexy is completely right, either. Necron does have a motive and a purpose, which is easy to see if you merely pay attention to his lines immediately preceding the final battle: When the Crystal first gave way to life in the universe, he was charged with watching over all of existence until it sent him a sign that it was ready to be ended. Kuja's destructive acts were severe enough that he interpreted them as his cue to return everything to nothingness, but Zidane and company were able to convince him that the will of the living was still going strong.