I think I'd go with [url=https://www.youtube.com/watch?v=K3hPeVou_Mk]this one[/url] for Therelon's theme.  

My favorite part has to be the beginning, with its melancholy and wonder.  But I'd be wrong to say the grandiosity halfway through is out of place.

As for the ending, well, when you're the world's foremost master of the arcane, you can seriously throw down when you need to.