I love the concept of nuffi (ironically) becoming immortal largely because you're at ease with, and even proud of, your humanity (nuffi's an orc but whatever), you were born with nothing but absolutely resent and reject the idea of being moved around like a pawn by these greater powers, you're on the edge of eldritch madness where the music in your head is about to subsume you utterly, you're resigned to that outcome despite all the people you've bled for, despite how hard you've fought for freedom, you're resigned to the fact that ultimately you - as an individual, are a rat in a cage but also you're a revolutionary, you don't believe it ends there, and you don't want to go out like a dwindling candle, so you break yourself in half and put half of yourself into not an instrument - music has not only been your life, it's part of you in open way few understand, but is it really you? if it was always them? you haven't figured it out yet but your anger, that's always been your own, and you're more interested in being direct and to the point right now - so you put half of yourself into a sword, borrowed (stolen) from a former heiress, in fact, as one last act of defiance against those who think you're their superior, who think they can move you around like a pawn.
There's the question remaining of at what point do you stop being one of the 'little guys' when you begin play those types of games, when you use those types of forbidden magics, but it's been a question you've always kept in mind since the moment you learnt to play your first note. At the moment you want to keep part of yourself as yours - not belonging to another. Yes, to stay alive, but also, to say fuck you, you can't take everything.