Ravenous Black Gryphon

War corrupted these once-proud creatures. The susurration of their wings now whispers omens of imminent demise.

Riding Requirements:

This mount is available to all eligible characters on your account.
Level 10
Apprentice Riding (ground)
Expert Riding (flying)

Source:

Time Rift Bosses (loot) in Tyrhold Reservoir, Thaldraszus.
Warden Krizzik (vendor) in Tyrhold Reservoir, Thaldraszus.
Gifted from an Alliance player using item dropped by Time Rift Bosses in Tyrhold Reservoir, Thaldraszus.
Cost: 3000

Notes:

There are three ways of obtaining this mount, depending on which faction you're playing. Both are linked to the the hourly Time Rift events in Thaldraszus.

Alliance players can purchase this mount with Paracausal Flakes, which are earned by running Time Rift events. It can also be obtained by Alliance players as chance loot from Time Rift bosses. Once learned, it can be used by characters of both factions.

There's also a second item: Gift of the Ravenous Black Gryphon, which cannot be learned directly, but can be used by the Alliance character who receives it (from Time Rift bosses) to teach the mount to a Horde character on a different account. This item is soulbound and cannot be passed to another character (including your own) or sold.