The Boy Within the Stone — R.L. Holmes

It is as black as a moonless night within his stone. His soul was pulled out of his faery body and placed into a little grey rock where he has remained for some time. He is not dead. His body lies limp next to his stone in a little cage, and has to be fed liquid food down a tube. He has been passed from one creature to another and still no one knows how to put him back together again.
Meanwhile, two northern warrior owls, brave and clever Arrowhead and Belvedere decide to take on the ghoads, discovering the tunnels leading to their corner of Blackstone. While they are in there they come across huge bones of the extinct giants and wonder why the ghoads have kept them. The ghoads have destroyed so much of Blackstone. They have incinerated forests and many creatures that live within, using the ashes of dead folk as their blood. Yet the giant's bones remain untouched.