Legend: The Cure

The king sent telegrams across the entire kingdom in search of someone who could cure his daughter's blindness. All the kingdoms in the land could not provide the answer. Finally, on his daughter's 8th birthday, a decrepit wizard appeared before his court, claiming he could cure the princess' blindness.

"What is this cure you speak of, wizard?," the King demanded.
"First, a warning. I'm sharing this cure, is because I am in my last days of life," the Wizard said.
"It is not to be taken lightly, for it is black magic. There is consequence. It could end the world."