This mount comes from Luk’Hok in Nagrand (Draenor). He is one of the 7 rare spawn mounts available in Draenor.
There is a 100% drop rate on this mount and everyone who tags him will receive one.
Luk’Hok himself can be found at one of 6 spawn points – Cords 65.42, 75.29, 77.40, 71.56, 79.56, 83.65. He has roughly a 12-28 hour spawn time.
He is surrounded by Leatherhide Bulls and Leatherhide Clefthoofs so if you want to avoid being knocked back into more trouble I would clear the area a little. Luk’Hok himself is a level 100 elite and has around 4892k hp. The fight is very easy at 110 and is over in a few seconds. I personally put out a call in general chat to see if there was anyone else camping or just in the vicinity that might like to nab the mount as well.