Now that you have arrived in Ala Ghiri, you can join Raubahn to discuss the strategy to seize Specula Imperatoris.
This quest is available if you have completed the quest The First of Many.
Starting the Quest
Talk to M'naago near Ala Ghiri in The Peaks to begin the quest.
Speak with Raubahn
Enter Ala Ghiri and attune to the Aetheryte if you have not yet done so, then go to the quest icon on the map and talk to Raubahn. There will be a cutscene. This one is important, so it is recommended to watch it either now or via the Unending Journey in an inn room.
Speak with Alisaie
Talk to Alisaie to complete the quest.
Next Main Scenario Quest
After you complete the quest, talk to Alisaie to accept the next quest: Hells Open.