You must gather 8 Melonfruit and squeeze their juices into the Cup of Elune at Sargeron.
The markings on the Sargeron ruins, combined with what you've gleaned from Furien's text make one thing clear:
There is something special about the old fountain in the Sanctuary of Elune.
It would seem that one could expect special power from washing their face in the fountain. First, of course, there would need to be something in the ancient fountain with which to wash.
Pondering this problem, you spot a melonfruit at the base of a nearby tree....
You will also receive:
- 2,450 experience
- 15 (if completed at level 90)
- 250 reputation with Silvermoon City