I was wondering about what is possible in the 5th book and I thought "is it possible shruikans heart of hearts is still around?"
I think it may be but it could have also been destroyed in the explosion at the end of inheritance. and I also doubt galbatorix would entrust something of such power to any of his servants (unless there are some we don't know about yet.) please add your opinion in the comment section, maybe this will be part of a future book?