Summon Resonant Echo

To get [item=187733] you need to find [item=189441] in Zereth Mortis and bring it to the Synthesis Forge*, then collect reagents for the craft

How to get Schematic:

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2. How to get [item=187733] video: https://youtu.be/gXjUgmJefOw
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4. Location map: https://i.gyazo.com/2441a782ff114d461fecb620f3819212.jpg
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6. What to look for Img: https://i.gyazo.com/193a10ffcd28c94c1a4c98ec38fcd191.jpg
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8. Inside the [object=375974] random Spawn Object near the The Sepulcher of the First Ones
   Most of them are near the water areas, but on mountain walls so you will probably need to use glider and jump from the top of use Need Door of Shadows.
   Possible locations of Crystallized Echo of the First Song
   /way 77.60 59.01 1
   /way 77.55 60.43 2
   /way 77.42 45.36 3
   /way 78.20 54.30 4
   /way 78.28 53.10 5
   
   
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Resources required to craft (all of them are zone related):
250x[item=188957] - drops all over the Zereth Mortis
[item=189169] - Drops from [npc=182326]
[item=189153] - 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 Pet:
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