The Onyxian Drake was one of the few mounts I’d be willing to buy from the BMAH but tonight that finally changed. I hadn’t even realised it was in the loot window until I summoned Jeeves to sell the items one by one but there it was. The Reins of the Onyxian Drake is an extremely low drop from Onyxia and can be found in a small cavern in the southern parts of Dustwallow Marsh.

Onyxian Drake outside lair

Ain’t she a beaut?

As of patch 8.2.5, the entrance is now located at 56.5, 69.3.