After Riol expresses his suspicions, Tataru informs you of an urgent matter that requires your attention at the Rising Stones.
Requirements
This quest is available if you have completed the quest Best Laid Schemes.
Starting the Quest
Talk to Tataru in the Rising Stones in Revenant's Toll in Mor Dhona to begin the quest.
Speak with Minfilia
Enter the Solar and speak with Minfilia. 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 the Doman Watch
Go outside and go southeast to where the orange arrow is pointing in the minimap. Speak to the Doman Watch. There will be a cutscene.
The Keeper of the Lake
Use the Duty Finder or Duty Support to enter The Keeper of the Lake. Please see the The Keeper of the Lake Guide for a walkthrough.
After you complete the duty in The Keeper of the Lake and exit the area, 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 the Doman Watch Again
Speak with the Doman Watch in Mor Dhona to proceed.
Speak with Alphinaud
Go northwest to where the orange arrow is pointing in the minimap to reach the Rising Stones. Enter the Rising Stones, go into the Solar, and talk to Alphinaud. There will be a cutscene.
Speak with Alphinaud Again
Talk to Alphinaud to complete the quest.
Next Main Scenario Quest
After you complete the quest, talk to Alphinaud to accept the next quest: Aether on Demand.