Gnna have to hard disagree with the other fella who posted here. While I also give this four stars I believe this track does encapsulate a final encounter or boss fight of some sorts. Boss fights don't have to be some huge epic Souls-like operatic piece. They can easily fit the world you've created, it's asthetics, it's elements and all and be quite perfect.
I think this works perfectly for what you're describing it to accompany.