Marielle advises you to speak to Laniaitte about Emmanellain's request for a more dangerous duty.
This quest is available if you have completed the quest Sense of Urgency.
Starting the Quest
Talk to Marielle in the Sea of Clouds to begin the quest.
Speak with Laniaitte
Go down the rope bridge or the wooden stairs to the east and go to the quest icon, and talk to Laniaitte.
Speak with Emmanellain
Talk to Emmanellain to proceed. Choose whichever dialogue option you wish.
Speak with Emmanellain near Voor Sian Siran
Go northeast and go up the slope. Make your way northeast to where the orange arrow is pointing in the minimap. Talk to Emmanellain to proceed.
Search for a Spring Crystal
Go east to the orange circle on the map. Go south up the rocky slope, and go southeast up the next rocky slope. Then go near the southeast edge of the orange circle to find a sparkling Spring Crystal. Check on it to find the necessary crystal. If this is not the correct crystal, check on the other large green crystals around the edge of this pool.
Deliver the Spring Crystal
Go northwest and make your way back down the two rocky slopes, then go to the quest icon and talk to Honoroit to hand over the Spring Crystal and complete the quest.
Next Main Scenario Quest
After you complete the quest, talk to Honoroit to accept the next quest: A Series of Unfortunate Events.