I struggle to think of one song to fit the story completely and usually have a song for a scene or for character's feeling at the moment.
This reminds me of one where the character ventures out of the God of Death castle and discovers it's an unwelcoming cold place and something else too. Basically, he is freezing and sees (let's say) humans around, which are both humans and not.
That's for feeling of Death at some point:
And that's for general somber vibe:
And this one, so later when I write a finale of the comic it will start to make sense: