Core Hound

Molten to the core!

Riding Requirements:

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

Source:

The Black Market Auction House (rarely)

Notes:

This unique mount is now only available (rarely) on the Black Market Auction House. It was originally available during the celebration for the 10th anniversary of World of Warcraft in 2014-2015. It was obtained by defeating Ragnaros in a special 40-player Raid Finder version of Molten Core ('Boldly, You Sought the Power of Ragnaros').