Alisaie urges the group to go west in pursuit of Erenville before you lose sight of him.
This quest is available if you have completed the quest The Medial Circuit.
Starting the Quest
Talk to Alisaie in Labyrinthos to begin the quest.
Optional: Labyrinthos Aether Current 3
Before you proceed, you may wish to go southeast down the slope, then northeast along the waterway to where there is an Aether Current. You can use the Aether Compass (found in Main Menu > Duty > Collection) to help you pinpoint its location. Check on the Aether Current to attune to it.
Speak with Y'shtola
Make your way west to where the orange arrow is pointing in the minimap. Talk to Y'shtola to proceed. There will be a cutscene.
While Transfigured, Speak with Alphinaud
You can talk to Y'shtola to extend the duration of the transfiguration, or to transform again if you lose the transfiguration effect. Be sure to stay within the highlighted area on the map, or you will lose the transfiguration effect.
Talk to Alphinaud to proceed.
Head to the Designated Location
Go west to where the orange arrow is pointing in the minimap. When you reach the orange circle on the map, go to the northwest edge of it to reach the glowing spot at the end of the northern bridge. There will be a cutscene.
Speak with Alphinaud
Talk to Alphinaud to complete the quest.
Aether Current Quest
Completing the quest "The Full Report, Warts and All" will unlock the blue quest Lost Little Troll in Labyrinthos. Completing "Lost Little Troll" will attune you to an Aether Current.
Next Main Scenario Quest
After you complete the quest, talk to Alisaie to accept the next quest: A Guide of Sorts.