Three primals are on the verge of being summoned again, stronger than before, and the Scions turn to you to put a stop to them.
This quest is available if you have completed the quest The Ultimate Weapon.
Starting the Quest
Talk to Minfilia in the Waking Sands in Vesper Bay in Western Thanalan to begin the quest.
Speak with Urianger
Exit the Solar and go north into the storeroom to find Urianger. Speak to him to complete the quest.
Next Side Quest
After you complete the quest, talk to Thancred to accept the next side quest: Ifrit Bleeds, We Can Kill It.