Formed covertly by Rogal Dorn after the adoption of the Codex Astartes, the protocol called for the Imperial Fists and their Successors to reunify into a Legion should Terra come under grave threat. Should this condition be met, the Imperial Fists, Black Templars, Crimson Fists, Excoriators, Iron Knights, Fists Exemplar, and Soul Drinkers were all to rendezvous in the Phall System before moving to save Terra. Because the protocol violated the edicts of the Codex Astartes and the will of the High Lords of Terra, the Last Wall could have resulted in the condemnation of the Imperial Fists and their successors as traitors.
The protocol was controversial even among the Successor Chapters themselves; Marshal Bohemond of the Black Templars made clear that he had obeyed Koorland's summons reluctantly, feeling that his chapter's first duty was to continue their galaxy-wide crusade against mankind's enemies, as dictated by Sigismund. Likewise, some of the more puritanical members of the Fists Exemplar, such as Zerberyn, abhorred The Last Wall, since it was their own founder, Oriax Dantalion, who had convinced Dorn of the wisdom of adopting the Codex Astartes and dividing the Imperial Fists Legion into Chapters.
Thus far the only known example of the Last Wall protocol being put into action was during the War of the Beast, where the combined forces of Dorn's sons fell under the control of Chapter Master Koorland. During the conflict, the Chapters of The Last Wall each contributed a portion of their strength to rebuild the extinct Imperial Fists.
- 1: The Emperor Expects (Novel) Chapter 14
- 2: Throneworld (Novel) Chapters 5, 9
- 3: Echoes of the Long War (Novel), [Needs Citation]
- 4: Shadow of Ullanor (Novel) Chapter 3