This is a remix of the final bowser battle in Super Mario 64. Fo' realz.
There is kind of a story behind this song that goes in sync with it. I actually had an entire epic battle with all the details worked out it my head (that could be translated into animation, if I had the abilities) in mind while writing this. You can probably tell by the structure of the song. If I feel inclined, I may write it out eventually and put it here.