Someone tell me how Xenosaga ended :-)

[RedFinch]

So I rented this game and I played through most of it; it was relatively fun and I was never bored, but after my five days were up, I didn't bother to check it out again.

Anyway, I made it to Proto Merkabah but didn't explore it and I hear this was relatively close to the end of the game.

So, can anyone tell me how it ended? I'd just be interested to know what I missed.