You rush to Ala Mhigo after receiving word that Maxima and the Populares with him have defected there.
This quest is available if you have completed the quest Soul Searching.
Starting the Quest
Talk to Alisaie in the Dravanian Hinterlands to begin the quest.
Speak with the Resistance Guard
Teleport to the Ala Mhigan Quarter in The Lochs, and go northeast to where the orange arrow is pointing in the minimap. Talk to the Resistance Guard and say Yes to enter the Royal Palace. There will be a cutscene.
Speak with Alisaie
Talk to Alisaie to proceed.
Speak with Hien
Teleport to the Doman Enclave and go southwest to the quest icon on the map. Talk to the Kienkan Guardsman and say Yes to enter the Kienkan. Talk to Hien to complete the quest. There will be a cutscene.
Next Main Scenario Quest
After you complete the quest, talk to Hien to accept the next quest: Seiryu's Wall.