the talon of horus: black legion: warhammer 40,000, book 1  <p>when horus fell, his sons fell with him. a broken legion, beset by rivalries and hunted by their erstwhile allies, the former luna wolves have scattered across the tortured realm of the eye of terror. and of abaddon, greatest of the warmaster's followers, nothing has been heard for many years. until now.... </p>