Endryd Haar, known as the "Riven Hound," was once a World Eater Astartes, a member of the first intake of Initiates raised on Terra, long before the XII Legion came to be known as the War Hounds, and several Terran decades before the rediscovery of their Primarch Angron upon the world of Nuceria.
Endryd Haar would go on to renounce his former allegiance to his traitorous Legion when they declared for the Warmaster Horus' cause during the early years of the Horus Heresy. He fought alongside other Loyalist forces while leading his own Blackshield unit known as "The Fangs of the Emperor," which faced the Traitor forces across the width and breadth of the galaxy during the Heresy.
Endryd Haar and his three Battle-Brothers were part of the first company of Initiates the XII Legion raised in the Imperial Geneworks on Terra, long before his brethren had taken the name of the War Hounds, and many solar decades before they would become Angron's "eaters of worlds." Only he would go on to survive that company; a remnant of a lost age, a living weapon akin to his Legion brothers who came after and yet subtly different in his controlled savagery.
Haar was an unusually large specimen amongst the Space Marines, and most unusual for his Legion, had never been implanted with the Butcher's Nails -- the archeotech cybernetic cortical implants used to augment a recipient's aggression to inhuman levels and transform them into a killing machine. There were no Nails in Haar's skull, for his savagery came from a deeper well. Endryd Haar survived dire wounds and returned time and again from shadowed fates that spelled the doom of all those around him as if he had been preserved by some unforeseen hand.
Haar and his command were believed lost during a campaign of the Great Crusade when his brethren cast in their lot with the Traitors. Endryd was driven to cold madness by the revelation of his Legion's betrayal of the Emperor when he returned to find the Imperium of Man riven by civil war. He cast off all traces of his Legion's insignia and honours, becoming a Blackshield, and swore a Death Oath to atone for the XII Legion's crimes. Forming a Blackshield unit known as "The Fangs of the Emperor" from the remnants of surviving Death Guard dragged from the battlefield, including Techmarine Erud Vahn, the Rivenhound led his ad hoc force against the Traitors wherever they could be found.
Eventually, the Fangs managed to capture the Sons of Horus vessel Cicatrix Tyrannis. Masquerading as its commander, Raxhal Koraddon, Haar led his forces during the Xana Incursion in a final, desperate attempt to recover weapons from a secret facility under the prison-forge city of Xana-Tisiphone. Their intent was to secure powerful Ordinatii weapons for the defence of Terra.
Obsessed with killing the Warmaster, Haar saw this as a perfect opportunity to truly hurt the Arch-Traitor. Those of his warband who rejected this new mission were killed at the hands of the Riven Hound, who would broke no dissension from those under his merciless command. The remainder of the Fangs managed to capture and secure three Traitor Ordinatus Ulator, a small class of Ordinatus Minoris, but powerful nonetheless. The Blackshields took command of all three of the Ordinatus Minoris intended as gifts for the Warmaster, and with malign savagery turned their dread power on their creators.
After losing the opportunity to secure the Ordinatus Ulator Nepothax, which was destoyed in a Traitor counterattack by an unfamiliar pattern of Battle-Automata, the Loyalists were forced to retreat to the Cicatrice Tyrannis and withdraw from Xana II. However, they still managed to secure both the Mithrax and Ashurax.
Endryd Haar would fight alongside the Loyalists as a field commander in the dark days before the Siege of Terra, accepting any mission -- whatever the odds of survival -- so long as in doing so he could spill the blood of the Traitors. Forces under Haar's command were sighted at such notable battles as Beta-Garmon IV and the Battle of Terra. Haar's ultimate fate is unknown.
- Artificer Armour
- Archeotech Laspistol
- Master-crafted Power Fist
- Iron Halo
- Frag Grenades'
- Krak Grenades
- The Horus Heresy - Book Six: Retribution (Forge World Series) by Alan Bligh, pp. 246-247
- Blackshields: The False War (Audio Book) by Josh Reynolds