Reins of the Bronze Drake



Reins of the Bronze Drake will summon Bronze Drake, ‎an bronze drake mount.

Source
This item is a 100% drop from Infinite Corruptor in the Culling of Stratholme on heroic mode. You have 25 minutes from the first wave of Scourge at the start of the instance to reach and kill Infinite Corruptor before he despawns. He can be found shortly before Mal'Ganis.