Original Composer: Yoko Shimomura
No version of this track has never been released as part of an official soundtrack, and thus doesn't even have a completely definitive name. While some might refer to it as 'XIII Theme 2' (based on the title in the original game's files), most people have come to know it as 'Axel and Saïx'. This version comes from the files of the original DS version of Kingdom Hearts 358/2 Days.
UPDATE (8/30/2022): The track is actually titled "Xemnus" which is not a typo on my part, but rather Square themselves. The title has been updated accordingly.
Let me know if you can think of any other tracks in the Kingdom Hearts franchise that have yet to be extended and I'll give it my best shot!
![](https://i.ytimg.com/vi/-fSxePh0_84/maxresdefault.jpg)