Now that you have informed Raubahn of the Garlean spy in the Flames, you return with Ilberd to the Rising Stones.
This quest is available if you have completed the quest Traitor in the Midst.
Starting the Quest
Talk to Ilberd in the Hall of Flames in Ul'dah to begin the quest.
Speak with Alphinaud at the Rising Stones
Go to Revenant's Toll in Mor Dhona and go south from the aetheryte to enter the Rising Stones. Talk to Alphinaud. There will be a cutscene.
Speak with Alianne
Go outside and go southwest to where the orange arrow is pointing in the minimap. Speak with Alianne to proceed.
Find Rhesh Polaali
Go southwest to where the orange arrow is pointing in the minimap. Dismount and enter the purple glowing circle. Defeat the Eques and Secutor first, followed by the Laquearius.
Afterward, check on Rhesh. There will be a cutscene.
Defeat Imperial Troops
You can defeat the troops in any order. For example, go south to the orange circle on the map, then enter the purple circle. Defeat the Signifer and Secutor first, followed by the Vanguard.
Then go northwest to the next purple circle. Defeat the Hoplomachus, then the two Vanguards.
Then go northwest to the next purple circle. Defeat the Eques, then the Laquearius. Afterward, defeat the two Signifers, then the Hoplomachus.
Speak with Alianne in the Tangle
Go northeast to where the orange arrow is pointing in the minimap. Talk to Alianne to proceed.
Report to Alphinaud
Go northeast to Revenant's Toll and enter the Rising Stones. Talk to Alphinaud to complete the quest. There will be a cutscene.
Next Main Scenario Quest
After you complete the quest, talk to Alphinaud to accept the next quest: Coming to Terms.