The Cabal's Bargain

The Offering

The Cabal was an Aeldari-led xenos conspiracy that had foreseen — by their psychic projections — that humanity would, if allowed to continue developing, eventually produce a galactic catastrophe greater than Chaos. Their solution was elegant and monstrous: support Horus, let the Heresy unfold, ensure that the Imperium broke under it, and that the human species died with sufficient cosmological violence to denude Chaos of its primary food source.

They approached Alpharius and Omegon with this thesis. The Alpha Legion considered it. The Alpha Legion did not announce its conclusion.

You may save your species, or you may save the galaxy. You may not save both.

— Cabal emissary, attributed mid-Crusade

What the Alpha Legion Did

The Alpha Legion turned. They fought for Horus. They were, by Heresy-era reckoning, traitors. But their actions during the Heresy were unusually surgical — striking at specific Imperial assets, refusing to engage where neither side's strategic position would change, sometimes inexplicably aiding the loyalists.

The Heresy did not produce the Cabal's predicted outcome. Humanity did not die. The Imperium did not break. Whether Alpharius and Omegon were trying to fulfil the Cabal's prediction or trying to prevent it has not been determined by any subsequent investigation, including their own continued silence on the matter.

The Modern Position

Imperial Inquisition holds the Cabal account in active classification. Ordo Xenos has confirmed Cabal existence; Ordo Hereticus has confirmed Alpharius's contact with it. What Alpharius decided, and whether the Heresy was a partial Alpha Legion failure or a partial Alpha Legion success, is unresolved.

A minority view: the Alpha Legion is still trying to deliver the Cabal's outcome in M42. They have ten thousand more years to work with. The Indomitus Era's long disorder may, by that reading, be working in their favour.

The Cabal's Approach

The Cabal — a xenos politico-philosophical cell of mixed Aeldari, anti-Slaanesh Drukhari refugees, and at least one species the Imperium has not been willing to formally identify — approached the Alpha Legion in late M30 with a proposition the Imperium has classified, when it has been forced to acknowledge it at all, as "the Cabal Bargain." The proposition's specific content has been recovered from three independent post-Heresy Inquisitorial sources, all of which agree on the central claim: the Cabal told the Alpha Legion that the Imperium of Man, if allowed to mature into its post-Heresy form, would eventually unleash Chaos on a galactic scale that would destroy every species in the galaxy, including humanity.

The Cabal's preferred outcome was that the Alpha Legion would side with Horus during the Heresy, ensure Horus's victory, and through Horus's subsequent corruption-and-collapse cause the Imperium to die in the cradle. The argument was: a Horus-victory leads to localized Chaos consumption of humanity; an Emperor-victory leads to delayed galactic Chaos consumption of every species. The Cabal preferred the localized outcome.

What the Alpha Legion Did

The Alpha Legion's response to the Cabal bargain remains the deepest unresolved question of Heresy historiography. The Legion's contemporaneous correspondence — fragments of which were recovered by Sebastian Thor's investigators during the post-Heresy reformation — indicates that Alpharius accepted the Cabal's claim as plausible-but-unverifiable, and that the Legion's subsequent operations during the Heresy were specifically calibrated to (a) appear to support Horus, (b) operate in such a way that the Legion's actual loyalties remained ambiguous, and (c) preserve options for either outcome.

The Legion's actual battlefield record during the Heresy bears out this interpretation. The Alpha Legion engaged loyalist forces, but specifically on the periphery of the conflict, and specifically in operations that disrupted Horus's primary strategic objectives as often as they advanced them. Alpharius's death at Pluto in 014.M31 came at the hands of Rogal Dorn — a loyalist primarch — but the surviving documentation suggests Alpharius may have deliberately positioned himself for that engagement, and may have welcomed the outcome regardless of which side won.

The Cabal in M42

The Cabal itself is documented in post-Heresy era as continuing to operate, though its membership has changed. The Aeldari elements have, by the surviving Heresy-era documentation, been replaced by post-Fall successor representatives — most likely Harlequin troupes operating under Cegorach's quiet authorisation. The anti-Slaanesh Drukhari elements remain. The species the Imperium has not been willing to formally identify is, by post-Heresy classified Inquisitorial speculation, related to the Watchers in the Dark; the speculation has not been confirmed.

The Cabal's current operational status, by Inquisitorial assessment from 035.M42, is that it remains active, that it considers its M30 Bargain to be unresolved, and that it is currently observing the Indomitus Crusade for signs that the Bargain's outcome can still be influenced. The Inquisition's recommendation, classified at Inquisitor-Lord-only access, is that the Cabal should be treated as a potential xenos-political actor but not as an active enemy unless it actively engages Imperial forces. The recommendation has not been challenged.

The Modern Imperial Position

The Imperium's official position on the Cabal Bargain is that no such bargain occurred. The position is not, by Inquisitorial standards, sustainable — the surviving evidence is too clear — but the official position is preserved because the alternative (acknowledging that a xenos faction predicted the Imperium's collapse before the Heresy began) is politically impossible for the post-Indomitus Imperial Cult to endorse.

Guilliman's personal log, written after his Macragge resurrection, contains a single paragraph on the Cabal Bargain: "I have read the surviving Heresy-era documentation. I find the Cabal's argument coherent. I do not find it correct. The Imperium has not yet collapsed into the galactic Chaos consumption they predicted, and I will work to ensure it does not. The Bargain is not the only Imperial future. It is a future I intend to prevent." The log is sealed. Roboute Guilliman has not publicly addressed the Bargain. The Indomitus Crusade has not been described, in any official Imperial document, as a counter-Bargain operation. It is, by Guilliman's private log, exactly that.

I have read the Cabal's argument. I find it coherent. I do not find it correct.

— Roboute Guilliman, personal log, post-resurrection