Silent Glider

Gasses naturally stored within the creature allowed it to survive within the depths, those same gasses also allow them to effortlessly float through the air.

Riding Requirements:

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

Source:

Soundless in Nazjatar.

Notes:

The NPC that drops this mount, Soundless, is a rare spawn in Nazjatar. It can spawn atop a number of the tall coral growths found in the Coral Forest, in the south-east of the zone.