I'd call that a boss theme...
NOT a boss battle song a boss theme... that's what I call it anyway.
You did a good job with bringing that feeling to life, Kind makes me think of Bowser from the mario game (more specifically paper mario).
Actually if you added some faster rhythm to this you Might just be able to turn it into a battle song... maybe, I'm not quite sure though.
The some of the sub-rhythms are a little quiet though, the main melody kinda drowns them out a little. But other then that I think its good.
Thanks for the feedback :D Yeah it IS kinda loud, but I didn't know how to adjust that at the time. And I meant confront, not boss battle. As in the general preparing to fight, like whipping out a sword and having a staredown. I'm going to work on an actual Boss battle song later too. For now, I'm only uploading one other song than the one I have, so please give feedback there as well :)
Please contact me if you would like to use this in a project. We can discuss the details.