Remember when Kadaj is telling the Geostigma kids that they, like him, "inherited Mother's memetic legacy through the Lifestream"?Originally Posted by darksword12
What he's referring to is Jenova's essence, her unique spirit energy, that got unleashed after the team defeated Jenova in the past. When the Lifestream gushed out of the planet to destroy the meteor, that tainted energy was spread around the world. Geostigma is the manifestation of the fight between Jenova's corrupted spirit energy, and the natural energy that exists in living things. So, anyone with Jenova cells - e.g. Cloud - and anyone who inherited that tainted energy - e.g. the Geostigma kids - suffers as a result.
When Sephiroth is reborn after Kadaj reuites with Jenova's head, he says he wants "the last thoughts of Geostigma's dead". Basically, the spirit energy of everyone killed by Geostimga. The spirit energy which carries Jenova's essence. He says that this energy could 'girdle the planet, choking' - presumably by corrupting both life and the Lifestream itself. Kind of like how Jenova behaved when she first arrived 2000 years ago, infecting and mutating other organisms with her virus-like biological matter.
Just before Cloud and Sephiroth begin their final fight, columns of dark energy start to manifest around them, apparently called down by Sephiroth. That's presumably the tainted Lifestream.
Reply With Quote