What if Kartein heals him? Will he though?

Ohhh why didn't I think of that?? Kartein is basically omnipotent when it comes to healing

Can he heal something that doesn’t exist anymore? I though it might be possible but I feel like they would have to have an arm to heal

lol that arm is long gone. maybe if they still had it he could reattach it but I don’t think he can heal thin air