Sanctum Gloomcharger

To queue for LFR, find the NPC Ta'elfar in Oribos. Take the portal into the covenant room and turn right — Ta'elfar is on the bottom right steps.

Queue for the LFR wing called 'The Jailer's Vanguard' through Ta'elfar, then defeat The Nine to have a chance at the Sanctum Gloomcharger's Reins dropping directly into your inventory.

The mount is farmable on LFR, Normal, Heroic, and Mythic difficulty, once per character per week on each difficulty. For Normal and Heroic, you can obtain a lockout on a character and extend it weekly to farm The Nine repeatedly, and after killing The Nine you can zone out and switch difficulty to attempt another version.