Minfilia asks you to meet with the Doman child, Yozan, who has asked to see you.
This quest is available if you have completed the quest What Little Gods Are Made Of.
Starting the Quest
Talk to Minfilia in the Rising Stones in Revenant's Toll in Mor Dhona to begin the quest.
Speak with Yozan
Exit from the Solar, then go to the quest marker on the map and talk to Yozan. There will be a cutscene.
Meet Hoary Boulder
Exit the Rising Stones and go southeast to where the orange arrow is pointing in the minimap. You will find Hoary Boulder. There will be a glow around him, indicating an instanced battle. Check on him and there will be a cutscene, and then the battle will ensue.
Solo Duty: Guardian of Eorzea
Attack Hoary Boulder until he becomes untargetable and kneels on the ground. Then attack Coultenet when he joins the battle, while dodging Hoary's attacks, until Coultenet is defeated. Afterward, attack Hoary until he is defeated.
Speak with Alphinaud
Go northwest and enter the Rising Stones. Go into the Solar and talk to Alphinaud to complete the quest.
Next Main Scenario Quest
After you complete the quest, talk to Alphinaud to accept the next quest: Recruiting the Realm.