Shimmering Aurelid

Though it was once created to defend the Sepulcher of the First Ones, with its primary function now completed, it now obediently follows your command.

Riding Requirements:

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

Source:

Achievement: Glory of the Sepulcher Raider

Notes:

This progenitor jellyfish is the meta-achievement reward for the Sepulcher of the First Ones raid in Zereth Mortis.

Introduced in:

Patch 9.2

Travel Mode:

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

Speed depends on your riding skill.

Matching Companion Pets:

Prototickles

Other Mounts Using the Same Model:

Cryptic Aurelid

Deepstar Aurelid

Depthstalker

More info on Wowhead:

Shimmering Aurelid taught by Shimmering Aurelid