I am home for two,
Within me - a third.
When you visit me these days,
Wonder will you weather....
Was I not destroyed?

Really, I only got it from the line "Was I not destroyed". After realizing that, I looked at the first line and figured that the "two" were Cloud and Tifa, and that the "Third" may be Zack.

As for my riddle...

It envelops all, and all is lost.
A light tap
Will bring the world back from certain destruction.
The crimson man did it, wielding his power of lightning.
Magic, strong magic, or is it just technology? Hard to say, these days.

Yet another that I have no idea the difficulty of.