Necron?

[The Unknown Guru]

Thats pretty deep

The last time I played this game I actually (for once) took into account everything to do with the main plot including all the technical bits and I still don't have the capability to explain anything. I'm still not aware that the Tree had any major purpose after the Mist disappeared

In Disc 4, the Mist reappears. The tree is going to be the catalyst for Terra's assimilation of Gaia.

As he's diminishing, he says that he'll never truly disappear as long as there is death and doubt in the world. Words to that effect, anyway. I figure Necron's like the counterbalance to the Crystal. The Crystal is the source of all life and spiritual energy, while Necron is the source of death and ending.

I haven't completed FFIX in a while, so please correct me if I'm wrong... but after Necron is defeated, there's an FMV of his remains rising above the Tree and exploding, right? That explosion, combined with Kuja's Ultima and related antics, seem to be what killed off the Tree more than anything else.

It's the portal to Memoria that blows up, but it pretty much has the same effect.

Necron being the "bizarro crystal" actually would make a lot of sense, but some of his lines imply that he is actually trying to help life, though. He says that in a world of nothing, there is no fear and that this is what all life desires.