After delivering Dadanen's letter, Drunken Stag needs your help to retrieve something.
This quest is only available if you started the game in Ul'dah, and you have completed the quest Supply and Demands.
Starting the Quest
Talk to Drunken Stag east of Horizon in Western Thanalan to start the quest.
Search for the Raw Nashachite
Go northeast and you will see three Ore Mounds glowing purple. Check on each one and a Prism Coblyn will attack. Kill each one to retrieve the three raw Nashachite.
Return the Raw Nashachite
Go southwest and talk to Drunken Stag again and hand over the raw Nashachite to complete the quest.
Next Main Scenario Quest
After completing the quest, you will need to be at least level 11 to proceed to the next quest. After you reach level 11, talk to Drunken Stag to accept the next quest: The Perfect Swarm.