The Magic Three of Solatia — Jane Yolen

"LOOK!"

They looked where Lann pointed, at the crags beneath the castle. The very rocks seemed to unwind themselves and a giant gray-green serpent uncoiled and stretched, turning its ugly head in their direction.

"If that is a seeming," said the fire giant, "I do not like what it seems to be."

The great lizard pumped its mighty wings. And with an awful scream, which sounded like the seven notes of the wizard's song, the dragon flung itself into the air...