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Halo: Silentium[2] is the third novel in The Forerunner Saga by Greg Bear, released on March 19, 2013.[1]


Like the first two novels in the Forerunner SagaSilentium is framed with an in-universe conceit, being presented as a series of Forerunner logs under investigation by ONI in the modern era. The files in question are said to have been extracted from two sources: the carapace of a deceased Catalog (designated Forerunner remains #879) and a damaged monitor. Both the "Bornstellar Relation," the fictional document that encompasses the narrative of Halo: Cryptum and ONI's recovery of 343 Guilty Spark which acts as the framing device for the plot of Halo: Primordium, are referenced.

In the opening chapter, a Senior Juridical sent under the orders of the Master Juridical meets Haruspis, the guardian of the Domain. He demands to be granted access to classified information pertaining to the Precursors and crimes against the Mantle, but Haruspis refuses him, telling that no one has such authority. Just as the Juridical tells Haruspis that he does have the authority to bypass him, the Domain itself requests to testify to the Juridical, who initially denies that it is even a conscious entity. The Domain then opens itself to the Juridical, who is quickly overwhelmed by the resulting influx of knowledge.

On Erde-Tyrene, Catalog observes the evacuation effort of the planet. Catalog is here to investigate the Battle of the Capital, which resulted in the deaths of the entire Old Council, and demands a testimony from both the Librarian and her husband - the IsoDidact, formerly Bornstellar-Makes-Eternal-Lasting. However, a warning of an approaching Flood fleet results in the IsoDidact having to leave to defend the territory, so Catalog is sent off with the Librarian. While it accompanies her, she tells it about the events that led to her becoming a Lifeshaper, and her growing split from the original Didact due to their differing opinions about humanity.

Over a thousand years earlier, shortly before the Ur-Didact went into exile, he and the Librarian gathered together at their estate on the world of Nomdagro. An associate of Haruspis visited their home and helped guide the Ur-Didact in the Cryptum's preservation process. After the Didact's exile, things continued to deteriorate on the Forerunner political scene. To remain seen as an asset to the Master Builder, the Librarian proposed an expedition to a local galaxy known as Path Kethona to learn about the Flood's origins. Legend dictated that 10 million years ago, ancient Forerunners journeyed to Path Kethona, but actual records detailing this journey had long since vanished. The Old Council approved of this venture and the ship Audacity was constructed for the long journey to Path Kethona. The crew consisted of the Librarian, a Builder named Keeper-of-Tools, a Miner named Clearance-of-Old-Forests, and two Lifeworkers named Chant-to-Green and Birth-to-Light. Arriving at Path Kethona, the crew of Audacity would find it seemingly completely devoid of life. However, they discovered that Precursor architecture existed this far out of the Milky Way. Amongst the artifacts was a vast fleet of ancient Forerunner vessels of war. The Librarian and her crew scanned the Forerunner vessels and found nothing of true interest; any records inside had been destroyed thousands of years ago, as they were uploaded in binary.

Eventually, the Librarian, Keeper and Chant discovered a planet with a civilization of primitive Forerunners confined to the planet and lacking any form of advanced technology; however, the planet's ecology was completely based upon Forerunner genetics. The crew landed on the planet to encounter the natives in person. An old female named Glow-of-Old-Suns took the Librarian to a valley where microbiological growths recorded the locals' history - essentially an organic analog to the Domain. By accessing this information reserve, the Librarian would learn that Warriors drove the Precursors to Path Kethona during the Forerunners' genocidal campaign against their creators ten million years earlier, and that the planet's inhabitants were descendants of Forerunners exiled there as punishment for refusing to partake in the destruction of the Precursors.

Back in the present, the Ur-Didact emerges from a stasis-bubble on a broken-down Builder hulk drifting in a Burn, the designation for a Flood infected star system. Also on-board is a former Promethean named Sharp-by-Striking, another Catalog and a Builder named Maker-of-Moons. Sharp lost favor with Faber and Maker was going to give Catalog testimony against Faber, so all three found themselves on the broken ship as well. Their destination is a Flood-infested world called Uthera Midgeerrd. Eventually a Precursor artifact composed of slithering star roads appears and threatens to destroy the ship. The Ur-Didact, willing to confront whatever lies in the Precursor artifact, remains on the ship while the others escape; only Catalog stays to accompany him.

The Ur-Didact and Catalog are captured by the Gravemind and the Ur-Didact's sanity is severely shaken by the resulting encounter. The Gravemind then reveals the true nature of the Precursors. They did indeed reject Forerunners for the Mantle and intended for humans to hold it. The Forerunners did not accept this and drove the Precursors from the galaxy and beyond. Some Precursors survived by going dormant, others became powder that could regenerate their old selves in time, but time rendered it defective and it only created sickness and disease. The Precursors vowed that none of their creations would rise against them again and that all life would suffer and be in perpetual agony, through their new form as the Flood.

Back in the Orion complex, Forerunner defenses continue to fall as the Flood begins to reactivate formerly dormant Precursor artifacts across the galaxy and use them to overwhelm Forerunner fleets. The Master Builder is revealed to be alive and well. He rescued the Ur-Didact, who was given power once again. A meeting occurs on Nomdagro between the IsoDidact, Ur-Didact and Librarian that does not go well. Arguments ensue and the Ur-Didact reveals the Gravemind drove him mad and that he would not let humans attain the Mantle. The Flood arrives and ravages Nomdagro as the Audacity and Mantle's Approach leave towards the greater Ark, now the last bastion of the ecumene.

On the greater Ark, Omega Halo is there in anticipation for a Flood assault. A power struggle ensues between the IsoDidact and other Forerunner commanders who think the Ur-Didact should instead lead them. The Master Builder manages to regain control for him and the IsoDidact by revealing that the Ur-Didact is being used as a pawn for the Gravemind; after Faber had recovered him, the Ur-Didact conveyed him a sadistic message from the Gravemind which had absorbed Faber's family.

A massive Flood fleet led by Mendicant Bias arrives and chaos erupts. In that confusion, the Ur-Didact uses a Composer to compose human populations being stored on Omega Halo and retreats towards Requiem. The Librarian follows behind him, grieving for the loss of her humans. Monitor Chakas is tasked with saving the rest of the humans on the Ark and taking them to the lesser Ark, still hidden from the Ur-Didact and the Flood. The IsoDidact and the remaining Forerunner commanders with Faber in tow go to the Halo and activate it to buy time. Although the pulse destroys some of the Precursor star roads and part of the Flood fleet, both the greater Ark and Omega Halo are soon destroyed by the star roads. Faber remains behind while IsoDidact and the other commanders attempt to escape, but they begin to plummet to their deaths as the Halo is torn apart. Chakas manages to save the IsoDidact and takes him to the lesser Ark via Faber's personal slipspace portal.

At the lesser Ark, the remaining six Halos are assigned their monitor caretakers in preparation for their distribution across the galaxy, Installation 07 having been deployed years prior. The IsoDidact has a brief conversation with Chakas, in which he gives him his new designation, 343 Guilty Spark, and assigns him to Installation 04. The IsoDidact then asks 343 Guilty Spark if he would fire the rings, were it his choice, but receives no response.

On Requiem, the Librarian sneaks aboard with the Audacity by trailing behind the Mantle's Approach. Requiem's defenses also view her as a friendly and let her in. The Librarian uncovers the Ur-Didact's plans with the Promethean Knights and finds one Promethean left uncomposed, Endurance-of-Will. Endurance, a former love interest of the Ur-Didact, is convinced to help the Librarian take down the Ur-Didact and seal him in a Cryptum. Once done, the Librarian tasks Endurance to watch over the Didact for as long as she can. As she leaves Requiem for Earth, the Librarian is confronted by a large group of Knights and wonders if Endurance chose to become one herself.

The Librarian then draws the Flood towards Earth to allow the IsoDidact to fire the seven Halo rings. She sends Chant-to-Green off to the lesser Ark with the planet's remaining humans and passes her title of Lifeshaper on to Chant while remaining on Earth herself. During her last days on Earth, the Gravemind sends down ancient human essences, including the Lord of Admirals, to reveal that the Domain was created by the Precursors as the collection of wisdom from over 100 billion years of knowledge and that it was ingrained in Precursor architecture for safekeeping. In short, the Domain is the mythical Organon. Sadly, the Librarian realizes that the Halos will destroy all of this, and that without the Domain, the Ur-Didact will spend the eons to come in complete silence, dwelling on his own madness and rage. As she watches the Portal's construction, she sincerely hopes humanity will one day inherit the Mantle.

At the lesser Ark, the IsoDidact activates the rings while Offensive Bias fends off Mendicant Bias' fleet, allowing the rings to fire before the latter can reach the Ark. In the end, 343 Guilty Spark reflects on the Halos working their power throughout the galaxy. In that instant, he receives the first signals of a young, previously-unknown civilization, which is swiftly extinguished by the Array's pulse. Compartmentalization processes then erase large portions of Spark's memory and he forgets his old life.


  • The story is presented through the eyes of many characters, including the Librarian, both Didacts, Catalog, Guilty Spark (Chakas) and the Master Builder.
  • The Iso-Didact survived Halo's firing on the lesser Ark as evidenced in the Rebirth Narrative.
  • This novel features the first example of Precursor war technology being active.
  • The Domain is revealed to be the Organon.
  • The Ur-Didact is encased in his Combat Cryptum by the Librarian.
  • The Librarian gave her title of Lifeshaper to one of her aids 'Chant to Green' in the hours before the Halo firing.
  • 343 added a Glyph code to celebrate the release of Silentium.
    • Also that the video that comes, with the entry of the codes, is the exact one 343 deleted from Halo: Combat Evolved Anniversary, that was noted as the "???" 12th Terminal with this expression;
      • "For decades we have battled an alien enemy we do not understand. Unprovoked, they brought our civilization to its knees, and forced us into hiding."
    • The next day the video was replaced with an audio epilogue called Rebirth narrated by Greg Bear, and which tells the story of Riser after the Halo Array was activated by the Bornstellar-Didact.