Adorned Vombata

You can get [item=187632] schematics to craft the mount from [object=375484] treasure in Zereth Mortis zone

1. 
   
2. This treasure is intended for those who already unlocked flying in Zereth Mortis .
   But you can get it without flying. Use Door of Shadows or similar ability, starting from the Gradle of Nascence closest vault entrance
   Door of Shadows locations:
   /way 40.57 75.49 1 Go on top of the triangle entrance ark
   /way 39.56 76.53 2 Step
   /way 39.57 76.66 3 Step
   /way 39.61 77.69 4 Step
   /way 40.09 78.08 5 Step
   /way 37.15 78.28 6 Grateful Boon treasure location
   
   
   
3. 
   
4. You need to pet all the animals on top of the mountain
   5x[npc=185296] 4x[npc=185297] 3x[npc=185298]
   They are running around and will stop when you succeed with the pet cast
   2 hard to find (use Door of Shadows to get there):
   /way 37.41 78.23 on top of the sphere
   /way 36.66 76.27 on the wall
   
5. 
   
6. After you pet the last one the [npc=185293] in the middle of the area will unlock the treasure
   Reward is [item=189478] that you can learn after completing the Schematic Reassimilation: Adorned Vombata
   It unlocks the [item=187632] mount craft at [npc=184172]. Reagents required => Adorned Vombata
7. 
   

Grateful Boon treasure is a part of Treasures of Zereth Mortis achievement.

[object=375484] & [item=187632] schematics video: https://youtu.be/FnEaoafgD3g