The Eye That Sees Far
The quest is unlocked after completing The Future of Hyrule scenario.
"An old man in Deya Village is said to be so knowledgeable, it's like he has all-seeing powers. Give him something rare or otherworldly—he'll tell you the location of that which you seek."
"When you visited the place that the Deya Village elder told you about, you found parts that might be just what you need. Maybe the mysterious fellow truly does see all."