That's what I meant when I asked about degradation. If the simulcarim had any the few times he sent it out into the void all those years ago. As the body isn't made out of dragon stuffs. Or at least isn't hinted at that, just that the eye acts like a core. Which is most likely what protected them during those trips. I also hope this doesn't go south since Nero barely had any wounds and wasn't in there for long before the corruption started to work on him.
