Farm the mount
How To:
1. Gather up a few players, who has a very very strong DoT; such as Hunters "A Murder of Crows" Which deals around 500k dmg over 30 seconds.
2. Since the boss has 3.2m hp, you'd need around 6-7 of these dots.
3. Enter Tempest Keep the Eye, and clear up till the boss.
4. Walk as close to the boss as you can, without pulling it(You should be able to stand IN range of it).
5. Time your casts, and use your strongest debuff.
6. Apply debuff and enjoy it dying in p1(before any of the other adds are released).
7. Loot boss, feign death and reset instance.
8. Repeat step 1-7.
Time for DoTs: less than 0.2 seconds from the first one being placed
Enjoy farming your mount
All Credits go to newsneez from oc