Urianger directs you to speak to Thancred about arranging your battle with the newly summoned Ifrit.
Requirements
This quest is available if you have completed the quest A Recurring Problem.
Starting the Quest
Talk to Thancred in the Waking Sands in Vesper Bay in Western Thanalan to begin the quest.
Speak with Swift
You can either teleport to Ul'dah or you can go outside and go southeast to reach Ul'dah. Use an aetheryte to go to the Ul'dah aetheryte plaza if you aren't already there, then go southeast through the hallway, then go southwest to reach the Hall of Flames. Talk to Swift.
Attune to the Aetheryte
You can either teleport to Little Ala Mhigo directly, or you can use an aetheryte in Ul'dah to teleport to the Gate of Thal, and from there go southeast to Southern Thanalan. Then go southeast to where the orange arrow is pointing in the minimap. Check on the Zahar'ak Aetheryte to complete the quest. This will unlock the duty The Bowl of Embers (Hard).
Next Side Quest
After you complete the quest, talk to Papalymo in the Waking Sands in Vesper Bay to accept the next side quest: In for Garuda Awakening.