Void-Scarred Windrider

Coming in Patch 11.1.5.

When the void energies were released, it drove most windriders feral. They killed each other and their trainers. The gates to their roost were locked by the survivors. Some surviving windrider's can still be seen gliding above, but none dare return to their new deadly domain to see what remains.

Riding Requirements:

Level 10
Apprentice Riding (ground)
Expert Riding (flying)

Source:

Void-Scarred Windrider in Vision of Orgrimmar (Revisited) (Instance).

Notes:

This wind rider mount with a void aura apparently drops from an NPC with the same name in the Vision of Orgrimmar (Revisited) instance. This instance is part of the revamped Horrific Visions added in Patch 11.1.5.

Travel Mode:

Ground (+60% or +100% speed)
Flying (+150%, +280% or +310% speed)

Speed depends on your riding skill.

Other Mounts Using the Same Model:

Grand Wyvern

More info on Wowhead:

Void-Scarred Windrider taught by Reins of the Void-Scarred Windrider