This mount comes from 4 possible daily quests, Back to the Pit, Defending Your Title, Maintaining Discipline, and The Aberrations Must Die. All of these quests are fairly easy and do not take much time to complete, as you only receive two of these quests a day that are randomly picked, however it seems like The Aberrations Must Die is always there on my server somehow.
Back to the Pit
This quest requires you to mount the Reins of the Icemaw Matriarch which is provided to you for the quest and slay six Hyldsmeet Warbear, which are found battling in the pit in the center of town. Which can be seen on this location map. The easiest way to defeat them is to pick one within the health range to still give you kill credit due to the NPCs fighting them also. Hit 1 for the Auto attack, then use 4 (their maul like ability), 5 (Does a knock back ability), and 6 (A charge that also stuns). It is a good idea to use the knock back when the charge is off cool down so you can stun them and no longer take damage until the stun wears off.
Defending Your Title
This daily requires you to slay six Victorious Challenger, which are also found in town, they are the NPCs standing around observing the other NPCs dueling. They are fairly easy with only about 12.5k health, but they have a very annoying Shield Slam move which they tend to use quite a lot.
This quest requires you to hit the Exhausted Vrykul in the Forlorn Mine (found here - location map) with the Disciplining Rod that is provided for this quest. The Exhausted Vrykul are the ones that are sitting on the ground. Since this daily is usually grouped with The Aberrations Must Die, it is best to enter from the east and clear them to the west until you reach the outside of the mine again.
The Aberrations Must Die
This quest is done here (location map), and requires you to break 30 Plagued Proto-Drake Egg, which are broken by freezing them by throwing a Vial of Frost Oil on the ground on top of them. The eggs are found in small groups possibly 1 to up to 7. If you consistently hit groups of 6, which are generally the normal size groups, you only need to collect 5 of the Vial of Frost Oil, which drop from the Valkyrion Aspirant, these NPCs can be found guarding the buildings, two at each door, or patrolling the rode, they also only have about 12.5k health, and since they are grouped up so nicely, it is easy to AoE them down.
At the end of the day, you need to turn all the quests back from where you picked them up, open your spoils bag and hope you get the mount, it is a low drop chance and usually you will get some cheese, water or even some snowballs. Best of luck to all of you trying to get this elusive mount!