The Crystal
FFO Name: Crystal Eye

"Mystical orb made of crystal."

After winning the Crystal from Astos you return it to Matoya to get the Herb.

The Crystal is called the Crystal Eye in the Japanese version. (Matoya uses it to see, makes sense, ne?) I assume this is a reference to the Fates in Greek Mythology, who shared an eye in some stories (such as Disney's Hercules). Or it could refer to a lot of fairy tales and such where the witch has a crystal ball to look in on people.