Even a five year old could understand THAT.

[Sephiroth]

About Exdeath
(SPOILER) Exdeath is a tree because Euno was sealed in the forest of Moore after he was defeated. He was so evil and had magic so potent that he turned the tree hw was sealed in evil as well, and it eventually came what we know as Exdeath

This is never mentioned in the original version of Final Fantasy V. Enuo defeats himself because the void engulfs him (what an idiot - he is immortal and then he trades it for a power he cannot control). However, X-Death "himself" is not a tree - he was born out of it - and of course he is part of the tree, blablabla, he can turn into a tree and a twig, et cetera...but X-Death himself is a fusion of evil souls sealed in the tree.

And that's why the void turns him into a mega chimera as Neo X-Death. Because it is the fusion of evil souls - X-Death's true form, like Ghido/Gill mentions.

And often people make some mistakes because they think the void, the cleft of dimensions/the rift and the great tree of moore are all the same. But it is not.