|This article is about the Fallen Space Marines; for the Novel by Mike Lee, see Fallen Angels (Novel).|
The Fallen are renegade Space Marines that split off from the Dark Angels Space Marine Legion ten thousand years ago and has since been scattered across space and time by a Warp Storm . They are the secret enemy of the Unforgiven, a group containing the modern Dark Angels Chapter and its successors. To those Fallen that dwell within the 41st Millennium, many have become Chaos Space Marines, others pirate and renegade warlords, while some have since regretted their heresy and live a life of peaceful seclusion.
The seeds of the Fallen have were planted during the Great Crusade. During the campaign against the Sarosh, enemy forces managed to sneak a nuclear warhead aboard the Invincible Reason, flagship of Lion El'Jonson, Primarch of the Dark Angels. Luther, 2nd in command of the Legion, discovered the plot but for a time his jealously of the Lion prevented him from stopping it. In the end however, he saved the Lion's life, but somehow his primarch discovered his hesitation. Luther and his forces were forced to return to Caliban in the aftermath, ostensibly for recruitment and administrative purposes but many felt it was akin to banishment. Luther and The Lion had another falling out after the Zaramund Campaign when Luther left Caliban to fight alongside Horus in the Zaramund Campaign.
As the Lion's absence from Caliban increased due to the Horus Heresy, Luther and his forces increasingly felt bitter and abandoned, left to deal with a rebellion by Caliban's disgruntled former nobility and Chaos affiliated Sorcerers. The Warp-taint plaguing Caliban became apparent, and Luther and his followers became convinced that Caliban would be destroyed by the Emperor when this became known, and that The Lion had knowingly exiled them as a death sentence. Thus the seeds of Heresy were planted. The Fallen degraded into even further treachery when an expedition to Caliban led by the loyal Dark Angels Chapter Master Belath arrived before Luther. Eventually Astelan and Zahariel led a purge against those among Belath's forces who would be loyal to the Lion, including the Chapter Master himself.
Eventually, Luther's Angels fully embraced treachery when they attempted to utilize the insurgents own Chaos powers to halt the rebellion on Caliban. At the end of the Horus Heresy, when Lion El'Jonson returned to Caliban, his fleet was met by a devastating barrage of defence laser fire. Stunned by the ferocious attack, Jonson withdrew his vessels from orbit and attempted to find out what had happened on his homeworld. A nearby merchant ship soon provided the answer; Luther, second-in-command of the Legion and the Lion's greatest friend, had apparently ordered the approaching fleet fired upon. His reasoning for this action unknown to the Primarch, it was suspected that Luther, like many of the Lion's brothers, had become influenced by Chaos.[Needs Citation]
The fury of the Lion and his Dark Angels at what they perceived as a terrible betrayal knew no bounds; Jonson himself immediately ordered a sustained bombardment of the traitor positions and led an attack against Luther's position personally. In the resultant battle the two adversaries struck blow upon blow against each other, tearing down the monastery around them until nearly the whole massive edifice had been leveled by their battle. Meanwhile, the massed guns of the Dark Angel fleet pounded the planet, until the very surface of Caliban began to crack under the strain of the bombardment. As the planet itself started to break apart, the battle between the Lion and Luther reached its climax. Luther, apparently aided by the powers of Chaos, unleashed a furious psychic attack that knocked Jonson to his knees and left him mortally wounded. But as the dying Primarch struggled to stand, his noble features wracked with pain, it was as if a curtain was lifted from Luther's eyes and he realised the full extent of what he had done. Devastated, the realisation shattered his sanity and he slumped down beside Jonson, no longer willing to fight.[Needs Citation]
Soon after Luther's breakdown a warp storm of unprecedented fury engulfed Caliban. In an uncontrollable flood of psychic energy, the warp rushed into the physical universe. The immense strain these forces placed upon the planet, in combination with the tectonic shifting and cracking caused by the orbital bombardment caused the horrific end of the entire planet; Caliban itself shattered, breaking into countless chunks of dead and dying rock. The 'fallen' Dark Angels who had served under Luther were sucked from the face of Caliban into the warp and effectively scattered throughout space and time. None know of these events other than the Dark Angels, their Successor Chapters and the Emperor on his Golden Throne. Even within the Chapters themselves very few brother-Marines know the full story. It is only when Dark Angels gain entry into the Deathwing that they learn that many of the Dark Angels who followed Luther are still alive.[Needs Citation]
Unbeknownst to those at the time, the Warp storm on Caliban and the subsequent scattering of the Fallen throughout time was the result of a causal loop in the 41st Millennium. After Cypher turns himself in to the Inner Circle in perhaps a desperate bid to change history, Cypher reveals The Rock has been host to an ancient device known as the Tuchulcha which when combined with two others (the Ouroboros and another held by Typhus) can create a bridge through time. Cypher warns that Astelan's Fallen are seeking the same devices in cooperation with Typhus, and that the two plan to create a new "Death Angels" legion by combining the Plague Fleet with the original army of Fallen. It takes the Watchers in the Dark supporting Cypher's mission for the Dark Angels to agree to aid him, and eventually all three devices are brought within proximity to Caliban and a time portal is opened. But as enemy Fallen close in on the portal Ezekiel convinces Azrael to destroy it, arguing that history should not be rewritten and the Fallen may bring catastrophe on mankind by changing history. Azrael commands Tuchulcha to scatter all those near the rift, inadvertently including the Fallen ten thousand years previous.
Sometime later, the Dark Angels' Librarians are struck down by a shock wave of terror and fell visions. Most of these are too fragmentary and fleeting to be recalled in detail, but the vision that strikes Ezekiel, seers itself into the mind of the Grand Master of Librarians. What he sees shakes Ezekiel to his core, as the entirety of the Fallen are revealed to him and he realizes that during the Horus Heresy, Luther had built a Legion-sized force of Dark Angels that were loyal to his cause. Worse still, Ezekiel now knows that the Fallen's numbers are even greater than the Inner Circle had feared, as a greater portion of them were still trapped within the Warp. Before Ezekiel or his Chapter can act on this though, the Great Rift is created and sends the Imperium into turmoil[17a]. Later during the Terran Crusade, Cypher and a group of Fallen proved vital in the rescue of the reborn Primarch Roboute Guilliman, but were arrested by the Custodes on Terra shortly after.
The Rock itself, is later invaded by a Daemon army led by the Fallen Daemon Prince Marbas, after the Great Rift's creation, and though they defeat the Daemons, the Chapter suffers heavy casualties[17b]. Years later rumours, psychic signatures and the torture-wrought confessions of captured prisoners tell the Dark Angels Chapter, that a large number of the Fallen are mustering within the darkest recesses of the warp-shrouded Imperium Nihilus. The rumours claim the gathered Fallen are the size of a Legion, that could bring the entire galaxy to heel and are being led by a single commander. Only Supreme Grand Master Azrael suspects this commander could be their Primarch's betrayer Luther himself[17c], as the Fallen was freed from his hidden dungeon during Marbas' invasion of The Rock.[17b]
There are several different types of Fallen. Not all of them have succumbed to the powers of Chaos, although every Psyker captured by the Dark Angels has been so far.  A large number of the Fallen have become true Chaos Space Marines, but many others realise that their actions during the fall of Caliban were questionable. Others, claiming that the Lion himself was Chaos-tainted and that Luther was the true loyalist have remained unrepentant and possessed of the same ideals they fought for during Caliban's fall. Disgusted by the perverse Chaos Gods and unable to reconcile themselves with the Imperium, such members of the Fallen often lead a solitary existence. Many become mercenaries or pirates, while others attempt to integrate themselves back into 'normal' human societies.[Needs Citation]
All of that is irrelevant to the Dark Angels, who believe that the only way they can restore their honour and trust within the Emperor's eyes is if all the Fallen are found and either made to repent or are slain. Consequently, the Dark Angels and the rest of the Unforgiven constantly hunt for the Fallen and regularly prioritise it above other concerns.[Needs Citation]
Those Fallen that are captured are taken back to the Rock, where Interrogator-Chaplains attempt to make them repent. Occasionally they do and so die quickly. More often than not though, the captured Fallen refuses and suffers a long, agonising death at the hands of those who would save his soul.
A record of the apparent motivation for the actions of those Dark Angels who would become the Fallen exists: the confession of Astelan, once a Dark Angels Chapter Master. This testimony, extracted by Interrogator-Chaplain Boreas, contains the following claims: Astelan himself is supposed to have ordered the attack on the Lion's approaching fleet, with the approval of Luther, because the Dark Angels on Caliban believed that El'Jonson had fallen sway to the powers of Chaos. Astelan claimed that while the Lion had been lost in the woods of Caliban as a child, he had had a brush with Chaos and had never quite lost the taint of darkness from the incident. He pointed out that while El'Jonson had moved through the Warp towards Terra to join the defence of the Imperial Palace, he had moved at what was believed to have been a deliberately slow pace; a pace slow enough to determine who the true winner of the conflict would be before committing his forces. In other words, Astelan believed that El'Jonson would not have hesitated to join Horus if it had seemed that he would have been the ultimate victor in the Heresy. Why else would the Lion, a man renowned for his strategic brilliance and speed of attack, have waited so long before leading troops to Terra? Astelan believed that by attacking his fleet, the Dark Angels stationed on Caliban were doing the work of the Emperor.[Needs Citation]
Astelan further claimed that Luther never fell under the sway of Chaos but was driven by his duty to the Emperor, fearing the traitorous nature of El'Jonson. Also, he revealed that, apparently, the majority of the men who had been garrisoned on Caliban were original members of the Dark Angels, Terrans who had been inducted before the arrival of El'Jonson as Primarch. This existing form of divide may have also contributed to the conflict on Caliban. Finally, he claimed that, in the ensuing battle between the seemingly loyalist Lutheran Angels and the possibly suspect Lionite Angels, Luther attempted to negotiate with the Lion before any more were slain. Refusing to talk, the Lion hastily ordered the bombardment of Caliban and descended to crush the Fallen in combat. Luther then apparently fought the Lion only as a last resort and mortally wounded him only when he had no other choice. The only thing that Astelan could not explain was the Warp-Storm that flung the Fallen far across the Galaxy.
This entire point of view, as told by a member of the Fallen, should be considered suspect at best and complete fabrication at worst; it could simply be a series of malicious lies or just a warped, inaccurate view of the entire incident. Often, those who fall under the sway of Chaos do not even realize that they are serving its ends, except that at the end of 'Angels of Darkness', Boreas asks for a tranmission to be sent to a solitary cell in the rock saying simply: 'You were right'. This cell is believed, by readers, to be that of either Astelan or Luther himself. This, from a loyal Dark Angel throws in to question the loyalty of the Dark Angels, The Fallen and Lion El'Johnson himself.[Needs Citation]
In another record, Interrogator Chaplain Uzziel was attempting to draw a confession from a Fallen in the bowels of the Rock. The Fallen decried Uzziel's attempts saying that the Dark Angels sent to Caliban with Luther were abandoned by Lion El'Jonson and the Emperor and robbed of the glory of the Great Crusade. Eventually the Fallen made a false repentance that led Uzziel on a crusade to recover the Lion Sword. Uzziel realized the repentance was false when he recovered the weapon only to discover it was in fact Luther's Sword.
This perspective is backed up by another record of a Fallen known as Cephesus. When finally tracked down by Interrogator Chaplain Bareus he claimed the same reasoning, that the Dark Angels on Caliban had been abandoned with Luther while the Lion claimed the glories of the crusade. Bareus was mortally wounded by Cephusus, but eventually the Fallen was slain by Brother Kaelan of the Dark Angels who received a field promotion to rank of Interrogator Chaplain by the dying Bareus.
This also ties in with the perspective given in Fallen Angels (Novel) where Luther declares that the Lion has forgotten about them. He then secedes from the Imperium and is joined by many of the Dark Angels stationed with him including the Chapter Master Astelan and the Librarian Zahariel 
Known Fallen Angels
- Attias the Untamed
- Cephesus — Captured by Interrogator-Chaplain Asmodai
- Gohorael[18a][18b] — Tzeentchian Sorceror, captured
- Marbas — Has reached Daemonhood
- Merir Astelan
- Obidiah Hrakon
- Sark Andour
- Sathariel — Sorcerer
- Sorl Mebbon
- Zhebdek Abaddas
- 1: WD231, [Needs Citation]
- 2: Angels of Darkness (Novel) by Gav Thorpe, [Needs Citation]
- 3: The Black Pearl (Short Story) by Chris Pramas
- 4: Unforgiven (Short Story) by Graham McNeill
- 5: Fallen Angels (Novel) by Mike Lee, [Needs Citation]
- 6: Eye of Terror (Novel) by Barrington J. Bayley, [Needs Citation]
- 7: Sons of Fenris (Novel) by Lee Lightner, [Needs Citation]
- 8: Insignium Astartes — Fallen Angels
- 9: Black Library, The Ascension of Balthasar
- 10: Codex: Dark Angels (6th Edition), pgs. 29–31
- 11: Sammael: Lord of the Eternal Hunt (Short Story) by Ben Counter
- 12: The Unforgiven (Novel)[Needs Citation]
- 13: Angels of Caliban (Novel), Chapters 24–28
- 14: Ravenwing (Novel), Chapter 3, Strange Forces
- 15: Deathwatch: The Flesh of the Angel (Short Story) by Ben Counter
- 16: Gathering Storm: Rise of the Primarch — Part 3
- 17: Codex: Dark Angels (8th Edition)
- 18: War of Secrets (Novel)