One thing bothers me about that final stage. As a general rule, solo parts are higher pitch than most of the others, because it carries better. If you're someone without the large range of a professional singer, especially a lower range like baritone or alto, it's hard to find anything to properly sing. I personally don't know of any pop music in my range.
Kroggles ensures the living stay living, and the dead stay dead.
Clobberella beats you up.
Teela Brown has a birdie!
Flosshilde communes with the very souls of the damned.
Walsung is actually pretty cool. For a guy made of metal.