The White Ravens is a Bonus Quest. You do not need to succeed to complete this quest.
The White Ravens
"Terrible news, my [lord/lady]. The Archmaesters believe that someone intends to sabotage the Ravenry. We must do something..."
Quest Duration: 45m
All Alignment QuestShould you select any above option, the following Bonus Quest will activate:
[Your Sworn Sword] successfully uncovered a plot to attack the Ravenry. The Archmaesters had the saboteurs killed, and their remains fed to the ravens.
[Your Sworn Sword] successfully defended the Ravenry from saboteurs. The Archmaesters had the culprits killed, and their remains fed to the ravens.