Tree Crest Flask

"I hear an elven flute. A joyful melody is being played in the main square - and passers-by cannot help but dance!"

- the Storyteller

Use

 * Part of the Elven Guard Paraphernalia, which can be brought together with the other pieces by the Storyteller. For this, he will tell you a legend.

Source

 * Looted from Crag Linnorm in the northwestern part of the Castle of Knives location.