Eriador - The Trollshaws
"Dawn take you all, and be stone to you!"
said a voice that sounded like William's. But it wasn't.
For just at that moment the light came over the hill,
and there was a mighty twitter in the branches.
William never spoke for he stood turned to stone as he stooped;
and Bert and Tom were stuck like rocks as they looked at him.
And there they stand to this day, all alone, unless the birds perch on them;
for trolls, as you probably know, must be underground before dawn,
or they go back to the stuff of the mountains they are made of,
and never move again.
That is what had happened to Bert and Tom and William.
(from: The Hobbit, page 49)
Sam: "Look Frodo. It's Mr. Bilbo's trolls!"
Sam: "Mr. Frodo? He's going cold!"
Pippin: "Is he going to die?"
Aragorn: "He's passing into the shadow world.
He'll soon become a Wraith like them."