Open your mouth.
Spit out three gemstones as bright as diamonds, each the size of a fingernail.
That was all the Formless Dragon did. It left Liszt with three Space Gems and then, with a high-pitched "woo Yi ya", kicked with its hind legs, spread its wings, and shot into the sky, never looking back. It didn't turn invisible again, maintaining the appearance of flowing mercury.
The twinkling, multicolored light, like a rainbow, faded in the distance.
Watching the calm sky, Liszt gripped the Space Gems in his hand, feeling a sense of loss. His first close encounter with a true living dragon had just happened and ended like that. His dreams of becoming a Dragon Knight didn't seem to have landed on the Formless Dragon, and he had to go back to cajole the Little Fire Dragon.
"But it's already worth it, three Space Gems, plus the original one, the Formless Dragon gave me four Space Gems!"