Dorn's Final Battle

The Hand

What the Imperium recovered after Dorn's last engagement in the 1st Black Crusade was a single severed hand, identified by gene-seed match as the primarch's. The hand was preserved by the Imperial Fists as a relic. The body was not recovered. No witness Astartes survived the engagement to describe what happened.

By chapter doctrine — and by Imperial public record — Dorn died there, killed in the boarding action against Abaddon's fleet. The Imperial Fists mourn accordingly. The hand has been venerated for nine thousand years.

A hand is enough to mourn. It was not enough to confirm.

— Imperial Fists archivist, attributed M34

The Quiet Doubt

The senior Imperial Fists captains have, in private papers across multiple centuries, occasionally noted that the absence of a body is not the same as the presence of a death. That Dorn — a perpetual by some readings, definitively not by others — could in theory have escaped the engagement and gone into exile. That the boarding action was a position the primarch had chosen specifically, against tactical advice, as if it were the engagement he wanted.

The chapter does not, as policy, pursue this line of inquiry. The grief is easier with closure than without it.

Where He Might Be

The minority readings: that Dorn entered the Eye of Terror with the corpse of an Iron Warriors champion, in pursuit of Perturabo, and has been hunting his rival ever since. That he is in stasis somewhere within the Phalanx, the Imperial Fists' mobile fortress-monastery, waiting for the right kind of war. That he is on Terra under a different name, having stepped aside from primarchhood deliberately. That he is, simply, dead.

With Guilliman and the Lion both returned in M42, the question of which other primarchs might return has become unusually current. The chapter is, by Inquisitorial assessment, watching for him.

Either the Iron Cage took him, or he chose to disappear. The chapter does not need to know which.

— Imperial Fists Chapter Master briefing protocol

The Recorded Account

The Imperial record of Rogal Dorn's final battle, codified by the Imperial Fists' surviving Chapter Master in 027.M32, places his death at the Battle of the Iron Cage — an Imperial Fists assault on a Iron Warriors-occupied space hulk drifting in the warp's eastern fringe. The Iron Warriors had spent decades fortifying the hulk into what the Imperium's surviving records call "the Eternal Fortress." Dorn led the assault personally with a Crusade-strength Imperial Fists detachment. The Iron Cage held for two weeks. Dorn was killed in the final breach.

The surviving Imperial Fists recovered a hand bearing the gauntlet Dorn had worn at the Siege of Terra. The hand was returned to Terra and interred with full Imperial honours at the Imperial Palace's secondary basilica. The chapter's official position is that Dorn died honourably in service to the Emperor and that the hand is sufficient evidence of his death to permit standard Imperial succession procedures. The succession proceeded.

The M42 Search

The Indomitus Crusade's opening years have given the Imperial Fists their first plausible opportunity to investigate Dorn's status without violating the chapter's standing administrative position. Guilliman's authority as Lord Commander permits Crusade-related investigations that would not be permissible under standard Chapter Master authority. The Imperial Fists' senior officers have, in three separate Indomitus-related briefings, indicated to Guilliman that they consider the question of Dorn's status to be unresolved.

Guilliman's response, recorded in his personal log, is that he supports the chapter's investigation if and when the chapter chooses to undertake it, but that he will not personally investigate Dorn's status because doing so would either confirm Dorn's death (closing a question the chapter has used productively for ten thousand years) or confirm Dorn's continued existence (raising the question of why Dorn has not made himself known to the post-Heresy Imperium). Either outcome would, by Guilliman's analysis, generate political consequences the chapter is currently better positioned to manage than the wider Imperium. The chapter has not yet undertaken the formal investigation. The current Chapter Master has indicated, in his quarterly Indomitus briefing, that he is still considering.