Carrilaut is certain that Lord Francel is not a heretic, and asks you to take warning to him of the accusation against him.
This quest is available if you have completed the quest Three for Three.
Starting the Quest
Talk to Carrilaut in the Observatorium in Coerthas Central Highlands to begin the quest.
Speak with Francel
Go north from the Observatorium to the quest destination. Go into the building and talk to Francel. Choose the dialogue option that includes the word edelweiss. There will be a cutscene.
Deliver the Letter to Haurchefant
Leave the building and go north to Camp Dragonhead. Attune to the Aetheryte there, then enter the southeastern building and talk to Haurchefant to complete the quest. There will be a cutscene.
Next Main Scenario Quest
After you complete the quest, talk to Haurchefant to accept the next quest: The Talk of Coerthas.