Q: If you defeat a stage of Klaw and The "Immortal" Klaw is in play, will the next stage still get the +10 hit points?
A: Yes. So long as The "Immortal" Klaw is in play, Klaw will get +10 hit points. When you advance to a new stage of Klaw, you will set his hit points and then add 10 for the side scheme. -(Developer Ruling, Hall of Heroes)