Pale Regal Cervid

To get [item=187639] you need to complete Cyphers of the First Ones in Zereth Mortis and bring [item=189455] it to the Synthesis Forge*, then collect reagents for the craft

Resources required to craft (all of them are zone related):
400x[item=188957] - drops all over the Zereth Mortis
[item=189176] - drops from many mobs in the zone [npc=183184], [npc=183249], [npc=183253] and so on
[item=187635] - Can buy on AH or farm from specific mobs (check dropped by section)

* Synthesis Forge Prerequisites to be able to see a schematic & to turn it in & craft the Mount:
Complete 3 parts of the main campaign in the Secrets of the First Ones Forming an Understanding
Complete [npc=181397] upgrade [order-advancement=1904] => [order-advancement=1932] (to craft pets) & [order-advancement=1931] (to craft mounts)
Complete Protoform Synthesis quest to craft pets / Finding Tahli questchain & After daily reset The Lost Component & A New Architect to craft mounts
More detailed info can be found here: Synthe-supersized!
/way 70.18 28.60 Servitor Interface (Mounts Forge Location)
/way 61.97 58.93 Protoform Synthesis Forge (Pets Forge Location)
Right now you will need to complete the prerequisites to interact with the forge and turn in the schematic quests

[item=189455] is a protoform synthesis mount.

To obtain this schematic you need to earn Cyphers of the First Ones achievement.
As earned the achievement check out your mail and get the schematic.
After bringing the schematic to Protoform Repository you will learn how to create [item=187639] mount.

[item=189455] how to get - https://youtu.be/5PZ8z7k7Glw

Materials list:

• 
  
• 400 x [item=188957] - drop from mobs all around Zereth Mortis
• 
  
• 1 x [item=189176] - drop from dominate mobs
• 
  
• 1 x [item=187635] - AH or Drop List
• 
  

To unlock protoform crafting:

Complete chapters 1,2 and 3 of Secrets of the First Ones zone campaign.
Research [order-advancement=1931] and complete [storyline=1285] questlines.
After daily reset complete The Lost Component + A New Architect quests to unlock [spell=366367].
Complete Protoform Synthesis quest to unlock [spell=366368]