Now that the winds have changed, Moghan parts ways with you as you set out for Zenith.
This quest is available if you have completed the quest Waiting for the Wind to Change.
Starting the Quest
Talk to Moghan in the Churning Mists to begin the quest.
Blow the Horn
Go northwest and look for a short flight of stairs to the west. Go up them and you will see an Aetheryte in the distance. Go to it and attune to it, then go west from it to where a ramp goes upward. Go up the ramp, then turn left and go up the short flight of stairs. Go west to the structure in the center of the grass, where there is a small ramp that spirals upward. Go up this ramp to reach a flat platform. Check on the sparkling Destination and there will be a cutscene. This one is very important, so it is recommended to watch it either now or via the Unending Journey in an inn room. (Main Scenario 1 > Heavensward Main Scenario Quests > Heart of Ice > Cutscenes 1, 2, and 3.)
Speak with Alphinaud
Talk to Alphinaud to complete the quest.
Aether Current Quest
With the completion of this quest, you can now start the blue quest "Waiting to Inhale" in the Churing Mists. Completing that quest will attune you to an Aether Current in this area.
Next Main Scenario Quest
After you complete the quest, talk to Alphinaud to accept the next quest: The Wyrm's Lair. There will be a cutscene.