The attack on the Axiom Archive seems recent. The culprits must be caught before the trail grows cold. Scour every corner of Hernand.
The Crow's Warning
Quest stages of The Crow's Warning
1. Gather clues on the "Crow" in Hernand
Head to Muckroot Ranch - located south of Hernand. Approach the hut with many crows perched on its roof to trigger a cutscene.
The Crowcaller will appear during that scene. After a short conversation and a duel, he will vanish.
Once you regain control of your character, you will be attacked by a group of his minions. Kill them all and this will end the current quest and start the next one.
On the outskirts of town stood a man resembling a crow. He appeared to be quite knowledgeable about the Greymanes. The hostility radiating from him was both intense and overt. He is clearly a lethal adversary with a singular, deadly purpose.