Serenade

Unlock the Sopranian Understanding node in the Daelic column of the Cypher of the First Ones. After unlocking it, a quest appears on the map that you must complete to unlock Protoform Synthesis, the mount crafting station. Without completing this, the Serenade schematic will not be available to craft even after obtaining it.

Enter the Sepulcher of the First Ones raid and jump down into the pool area before the first boss. Be cautious as the trash mobs will attack you. Run left to the back of the room and find the schematic hidden vertically inside a chain ring in the corner, under the platform between the chains.

To craft Serenade you need 1x Helicid Lattice, which drops from snails in Zereth Mortis or can be purchased from the Auction House, and 1x Crystallized Echo of the First Song, found on the island where the raid is located.

Bring your schematic and materials to the Synthesis Forge at 61.2, 58.9 in Zereth Mortis to craft Serenade.