Final Quest

"I'm not a warrior," the green dragon complains. But he goes and fights with the monster anyway.
After a little while, the green dragon wins the fight, and colour seems to flood back into the place. The lake changes from black to blue-green, and water nymphs appear in it, seemingly out of nowhere.
One of them walks over to you, smiling. "Thank you," she says. "If there is any way we can repay you, please let us know."
"We will," you reply.
The nymph smiles again, and vanishes.
"What do you want to do now?" the green dragon asks after you've picked up the stones.