Everything starts with Nibelheim.
Long before we get caught up in all the lies of Nibelheim, Sephiroth's born there, although he doesn't know the village is his hometown.
Nibelheim is where Cloud and Tifa share their promise.
Nibelheim is the heart of the story where everything begins for the hero, heroine and villain.
We visit Nibelheim 4 times during the course of the game. The first time is during the Kalm flashback, where we're sold Cloud's illusion of what happened.
The second time we visit Nibelheim is the first physical visit to the location, where we find everything rebuilt and a lot of liars installed to push Shinra propaganda about what happened. Cloud and Tifa know the truth, or partially anyway, but here we have a very elaborate lie making them doubt themselves.
The third visit is Sephiroth's lie because he knows Cloud was there, but he tells the group Cloud wasn't there. This breaks Cloud's mind when Tifa doubts their shared memories because Cloud never told her he was in Nibelheim back then because he was hiding from her.
The final visit is during the lifestream scene where we get the truth.
So, since Nibelheim is the emotional core of the story, wouldn't it make sense for the final battle between Cloud and Sephiroth to happen there? Sephiroth crafts one last illusion to try and defeat Cloud by bringing him back to Nibelheim, the place where he's most vulnerable, where he feels like a failure.
However, Sephiroth has no idea what Cloud and Tifa shared in the lifestream, so this isn't a place where Cloud feels like a failure, it's the place where he finally learned the girl he loves felt the same way the whole time. It's the place he defeated a villain and saved the girl he loves. It gives him strength to overpower Sephiroth and defeat him again within that fateful seven seconds.
Because if everything starts in Nibelheim shouldn't it end there too?













