Umm, I was recommended to go here for something like this, so I thought I would ask. But, on Zone of the Enders, there is a track played when you go against Anubis 1st, second, and Fake Anubis. Where either you have to lose, retreat ect. It had a nice darkened remix of Beyond the Bounds at some parts. I was wondering if anyone knew where this mysterious track is? It's not on any of the OST's or anything... thank you if you can help me!

Try this url: http://gh.ffshrine.org/song/1080/9
It's from ZOE 2 OST - The link's around the top (it looks hard to navigate there, lol). I hope it's the one you're talking about, and it does sound nice.
Oooo, and this one: http://gh.ffshrine.org/song/1080/13
From the same OST and has more beyond the bounds remixes as well.
I hope that I've helped out in any way. ^_^

its under anubis boss:
http://www.genesoul.net/zoe/

Wow, nice - thanks Zero Akira.