Eustace coveted enchanted gold and turned into a dragon but Aslan changed him back to a boy again by scraping off the scales and washing him in clean water. A symbol of rebirth and baptism.
The pleasure (quite new to him) of being liked, and still more, of liking other people, was what kept Eustace from despair. For it was very dreary being a dragon. He shuddered whenever he caught sight of his own reflection as he flew over a mountain lake. He hated the huge, bat-like wings, the saw-edge ridge on his back, and the cruel curved claws.
- The Voyage of the Dawn Treader"