A Rebirth of Memory

A Rebirth of Memory was a momentous event in the history of the Hammer Guard Space Marine Chapter, when they were finally reinforced with newly revealed Primaris Space Marines, the next-stage of evolution of the Adeptus Astartes. These newly acquired battle-brothers helped to boast the sorely depleted ranks of the Hammer Guard who had suffered greatly in their battles against the Forces of Chaos, since the formation of the Cicatrix Maledictum after the fall of Cadia during the 13th Black Crusade. With their number finally bolstered back to full-strength, the Hammer Guard was finally able to take the fight to Chaos and prosecute the wars of the Indomitus Crusade with renewed vigour.

Background
After the Chapter was reunited in the Solaritus System, they were provided with dire reinforcements in the form of the new Primaris Marines, but also with long-lost knowledge. During the war on Gabarlos, the 3rd and 7th Companies had been pushed back into their temporary command center, the ruins of The Anvil. As they fought desperately at the edges of the Fortress, a long-hidden vault at the end of the great Hall opened as long-dormant mechanisms spun to life, apparently awoken by the war around the ruins. Legate Morake ordered the vault to be left untouched until Dominum Custodem Stormfury arrived, certain that the secrets within the vault were too important to not include the Custodem in their recovery. Once Stormfury arrived, flanked by Clericus Charos and Sunlord Darkblade, Morake led them to the vault, where they discovered the secrets within.

Of those secrets, which included early mentions of the Hammer Guard in campaigns alongside ancient relics such as the Solis Flagro, none were as important to the chapter as the document that came to be known as the Originem Fabula. This document detailed the origins of the Vault itself, the Book of Redemption, and the reason for the Hammer Guard's shame, along with their gene-line itself. It confirmed their fears that they were the successors of a chapter that had turned renegade, but also divulged to them the origins of their gene-line, originating from the stoic and dutiful Imperial Fists. Now gifted with the knowledge of their origins and the requirements for their redemption, the Hammer Guard joined the Indomitus Crusade with vigor.