After learning about the Manusya and Mrga and dragons, you set off to meet Krile's friend Nidhana.
This quest is available if you have completed the quest House of Divinities.
Starting the Quest
Talk to Matsya in Thavnair to begin the quest.
Search for Nidhana
Go northwest to where the orange arrow is pointing in the minimap. You may wish to attune to the nearby Aetheryte before you proceed. Then go east from the Aetheryte and check on the Arkasodara Alchemist. There will be a cutscene.
Speak with Nidhana
Attune to the Aetheryte if you haven't already, and speak to the Chocobokeep if you wish. Then go south to the quest icon in the minimap. In the building, talk to Nidhana to proceed. There will be a cutscene.
Speak with Nidhana Again
Go outside and turn right, and go up the eastward slope. Continue making your way up the winding path until you reach the quest icon. Talk to Nidhana to proceed.
Speak with the Drunken Deepa
Talk to the Drunken Deepa and follow it. When it stops, move away from it until a glowing circle appears around it. Stand in the glowing circle.
Afterward, talk to the Drunken Deepa again, and repeat the steps described in the previous paragraph. Repeat this two more times.
Obtain the Drunken Deepa
Check on the Drunken Deepa to take it.
Deliver the Drunken Deepa
Go south and talk to Nidhana to hand over the Drunken Deepa and complete the quest.
Next Main Scenario Quest
After you complete the quest, talk to Nidhana to accept the next quest: Shadowed Footsteps.