You must venture to The Burn to pursue the lead that you have as to Alphinaud's whereabouts.
This quest is available if you have completed the quest Sisterly Act.
Starting the Quest
Talk to Hien in the Kienkan in the Doman Enclave to begin the quest.
Speak with Hien near the House of the Fierce
Teleport to the House of the Fierce in Yanxia and go northeast to where the orange arrow is pointing in the minimap. Talk to Hien to proceed.
Use the Duty Finder to enter The Burn. Please see the The Burn Guide for a walkthrough.
After you complete the duty in The Burn and exit the area, there will be a cutscene.
Speak with Hien in the Doman Enclave
Talk to Hien to complete the quest.
Next Main Scenario Quest
After you complete the quest, talk to Hien to accept the next quest: Shadows in the Empire.