When any Dragon hatchling is born, the stones of the egg nest are magically turned to crystal. Each crystal will absorb the loose magic released from the hatching thus giving the crystal specific magical powers. Most crystals will be of a range of colors from red to green or blue, but some crystals will be as clear as the air. These are the most powerful and are usually from the nest of a Wish Dragon.
The Trolls specially crave these crystals for their power or wealth. They know these are stones of the earth transformed by magic. But for the Dragons, the crystals are necessary for their sleeping nests.
It did not matter how much gold or other items a Dragon gathered for its bed for at the core of it is the crystals the Dragon was born with. The crystals are like a soft cushion which allowed the Dragon to sleep soundly and in peace. If a crystal was taken, the Dragon would sleep fitfully and if all of the crystals were gone, then the Dragon was not able to sleep at all! One doesn't want to run into a Dragon that hasn't had a good night sleep... where do you think those evil stories of Dragons attacking villages came from. So who were stealing the crystals? The Dragons already knew about the Trolls which is why Dragons weren't on speaking terms with them for eons. Rumor had it that even Goblins were known to trade in stolen crystals.
Now we know about the birth of Spite, but why is she with the Wizard Dewin? What does she hope to find there and what does she know about Hungry, the Wish Dragon?