The Grey Raven is a short story in the Horus Heresy Series. It was written by Gav Thorpe and published online on 7 December 2016 as Day 7 of Advent 2016.
Returning to Terra, former Librarian Balsar Kurthuri faces the judgement of the Sigillite.
Returning to Terra, the Librarian Balsar Kurthuri of the Raven Guard must face judgement for breaking the Edict of Nikaea, even if it turns all of his erstwhile allies against him.
Balsar Kurthuri of the Raven Guard has always followed his primarch's orders. When the Edict of Nikaea forbade psykers within the Legions, he returned to the line squads without a second thought. When the Warmaster's treachery became known, he gave freely of his powers. Now, as the war appears to be entering its final, grim stages, at Lord Corax's command he must return to Terra to face judgement for the apparent crime of unswerving loyalty...