Jigglesworth Sr.

It's unclear how the saddle stays atop this formerly feline friend, but somehow the House of Plagues made it work. Science.

Riding Requirements:

This mount is available to all eligible characters on your account.
Level 10
Apprentice Riding

Source:

Achievement: Fates of the Shadowlands Raids
Mirioszin in The Parting Glass, Valdrakken, Thaldraszus.
Cost: 3

Notes:

This slimey saber mount has returned in Dragonflight Season 4 and can be purchased from Mirioszin in The Parting Glass in Valdrakken. This inn is located on the west side of the Bronze Enclave. The mount can be purchased for 3 Antique Bronze Bullion which is a new currency that can be earned from Dragonflight Season 4 'Awakened' raids.

Originally, this mount was a reward for completing all three Shadowlands raids (Castle Nathria, Sanctum of Domination, and Sepulcher of the First Ones) while they had the Season 4 'Fated' affix, on Normal difficulty or higher.

The opportunity to obtain this mount will probably end once The War Within launches.

Introduced in:

Patch 10.2.6

Travel Mode:

Ground (+60% or +100% speed)

Speed depends on your riding skill.

Matching Companion Pets:

Jiggles

More info on Wowhead:

Jigglesworth Sr. taught by Jigglesworth, Sr.