Well I've lived a good life regardless of my origins, i'm a popular and powerful soldier with good friends, my mother was clearly a human woman and not Jenova that's a no brainer... all it takes is a little rational thought to handle this situation... oh wait hang on there's one more book....

Ok Sephiroth, you can do this... this is your moment, just take the leap and land the blow.

With the black Materia in hand, I will cast Meteor and wound the planet... gaining all of its energy in the process!