Boreas Whistle

Boreas Whistle is an other item. When used, it awards the Boreas mount.

Source
Boreas Whistles can be obtained as a drop in a duty or purchased from vendors.

Duties
Boreas Whistles can be obtained as a drop from the following duties:
 * Akh Afah Amphitheatre (Extreme)

Vendors
Boreas Whistles can be obtained during the Moogle Treasure Trove event by exchanging 30 with the following vendors:
 * Itinerant Moogle