Lagomort War

The Lagomort War was the first recorded official action of the Lions Malevolent Chapter. This was a joint campaign launched by the Dark Angels and two of the Unforgiven Chapters -- the Angels of Vengeance and the Lions Malevolent -- to quash the incursion of the Chaos Lord known as the Slaughter King and his Khornate war hosts. In reality, the Dark Angels and their Successors had their own secret agenda, and used the war as a cover to seek out and capture a notorious Fallen known as Brother Luciferus.

History
The first recorded action of the Lions Malevolent Chapter was during the Lagomort War against the Forces of Chaos commanded by Chaos Lord known as the Slaughter King, a fanatical follower of Khorne. During this campaign, the Lions Malevolent were joined by two other Chapters -- the Angels of Vengeance and their progenitors, the Dark Angels themselves. Unknown to any but the Unforgiven, the Lagomort War was in fact a cover for the hunt for a member of the Fallen -- those Dark Angels who followed the Arch-Betrayer Luther, the I Legion's second-in-command, into damnation and resulted in the destruction of the Dark Angels' homeworld of Caliban at the conclusion of the Horus Heresy. These so-called Fallen Angels have been continuously hunted for ten millennia by the Dark Angels and the Chapters of the Unforgiven.

This particular Fallen, known as Brother Luciferus, was well known to the Inner Circle, for he was a true heretic that was utterly devoted to the Ruinous Powers -- a powerful psyker who would appear before the Dark Angels' and the other Unforgiven Chapters' Librarians -- taunting them for their failures and their sad devotion to an Emperor and a Primarch long since gone. He would further insult them by naming himself Lion El'Jonson. He had been hunted for nearly two millennia, but always managed to stay one step ahead of his pursuers. Every time he was cornered by the Unforgiven, he would always somehow manage to effect his escape. Now Luciferus was operating openly on Lagomort IV, and the Dark Angels and their Successors were determined that this time, there would be no escape. The Inner Circle committed all available forces to the war -- three companies from the Dark Angels, one company from the Angels of Vengeance and the entirety of the Lions Malevolent Chapter, launching an all out assault on the Lagomort System.

While the majority of the Astartes from the three Unforgiven Chapters fought against the massed forces of the Slaughter King, the Dark Angels elite 1st and 2nd companies (the Deathwing and Ravenwing) headed straight for the Fallen who was taking refuge within his stronghold. They would be joined by some of the finest Astartes the Lions Malevolent had to offer -- ten of their most promising recruits who had been chosen right at the start, by the Dark Angels, to form the Lions Malevolent own elite 1st and 2nd companies. Only the Grand Masters, their veteran elite and the Unforgiven Chapters Masters knew the full truth of this war and the Fallen in question. Using all the skill and determination that the Emperor's Astartes are famed for, the Lions Malevolent would prove themselves to be true Sons of the Lion. Brother Luciferus was captured after a long hard fought battle and the Slaughter King and his Khornate hosts were lain by the fury of the Lion-borne.

Turned over to the 'tender' mercies of the Interrogator-Chaplains, soon the prison cells of The Rock resounded with the agonised screams of the Fallen, who would either repent or suffer a long, agonising and drawn out death. The Interrogator-Chaplain chosen for this task would be the first Interrogator-Chaplain raised from the ranks of the Lions Malevolent themselves, Brother Anaziel. He would ultimately fail in his task, for Luciferus was utterly corrupted by the powers of Chaos, therefore he was granted extreme unction for his crimes. Anaziel would go on to become the Chapter's Master of Repentance and would eventually make four Fallen repent during his long and illustrious career, but would forever after be haunted by this failure for the rest of his days.