You and Alisaie are ready to depart Ala Ghiri to deal with any imperials that attack.
Requirements
This quest is available if you have completed the quest Strong and Unified.
Starting the Quest
Talk to Alisaie in Ala Ghiri in The Peaks to begin the quest.
Patrol Wightrock
Leave Ala Ghiri and go west to where the orange arrow is pointing in the minimap. Go to the northwest edge of the orange circle on the map and check on the purple Destination. Defeat the Imperial Canis Pugnax and the Imperial Laquearius that attack.
Then go north to where the orange arrow is pointing in the minimap. Go just west of the center of the orange circle on the map and check on the purple Destination. Defeat the Imperial Slasher and Imperial Sky Armor that attack.
Rendezvous with Alisaie
Go northeast to where the orange arrow is pointing in the minimap and talk to Alisaie to complete the quest. 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.
Next Main Scenario Quest
After you complete the quest, talk to Alisaie to accept the next quest: Heavens Weep.