Adnachiel was the Company Master of the Dark Angels Chapter's Fourth Company when the Ork forces of The Beast invaded the Imperium.
He later commanded the Strike Cruiser Herald of Night when he took part in his Chapter's battle against the Orks after they invaded the asteroid field known as the Astorias Cloud, which contained numerous Imperium mining installations. During the battle, he was prepared to come to the assistance of Grand Master Sachael, after his Battle Barge, Reprisal, was cornered by Orks ships, but was suddenly told by the Master of the Deathwing to abort his rescue attempt. The Dark Angels had just received word that their aid was requested for a strikeforce that was being formed on Terra to attack the planet Ullanor and Adnachiel had been chosen to be a part of it. Though Adnachiel did not want to leave without aiding Sachael, the Deathwing's Master told him of the mission's importance, as Ullanor was discovered to be the origin point of The Beast's invasion force, and promised the departing Company Master that he had no intention of dying within the asteroid field.[1a]
Adnachiel later reappeared on Terra before the High Lords as part of his Chapter's taskforce[1b] and took part in the invasion of Ullanor at the side of Vulkan.
- 1: The Hunt for Vulkan (Novel)
- 2: The Beast Must Die (Novel), Chapter 3