Forerunner-Precursor war

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Human-Forerunner wars

Forerunner-Precursor war


c. 10,000,000 BCE


Milky Way galaxy and Path Kethona


Decisive Forerunner victory

  • Precursors driven to near-extinction
  • Rise of the ecumene as the dominant galactic power

Forerunner ecumene




Near extinction

"I am the last of those your kind rose up against and ruthlessly destroyed."
— The Primordial to the Didact.

Ten million years before the Forerunner-Flood war,[1] the Forerunners rose up and destroyed their creators, the race of beings known as the Precursors, in a sudden uprising.


Most details and even the causes of this conflict remain obscure or contradictory, as any records of it had been completely lost and/or intentionally suppressed by the Forerunners over the subsequent millions of years.[2] According to some Forerunners who later learned of the event, the Precursors had decided to erase the Forerunners from existence, as they had done with many of their other creations.[3] The Librarian learned this information from the Path Kethona Forerunners' biological memory reservoir,[4] which, in turn, recorded the memories of the early Forerunners who fought in the war. However, the Gravemind stated that the Forerunners struck against their creators completely unprovoked, enraged by the Precursors' decision to pass the Mantle of Responsibility on to prehistoric humanity instead of the Forerunners. According to the Gravemind, the Precursors did not defend themselves and simply marveled at the sheer violence the Forerunners were capable of.[5]

After driving the Precursors away from the Milky Way galaxy, the Forerunners—under the leadership of the then-dominant Warrior rate[6]—chased them down to the satellite galaxy of Path Kethona, where they finished their work, driving the Precursors to near-extinction. However, the Forerunners who traveled to Path Kethona never returned to the Milky Way, as they were unable to bear the burden of what they had done. Those who defied their commanders and invoked the Mantle were either executed or exiled on a barren planet and would later remain as the only Forerunner survivors of the fleet that conducted the extermination campaign at Path Kethona.[7]


Though all Precursors were believed to have been eradicated, the Primordial, who originally claimed to be the last Precursor, later stated that a number of Precursors survived by escaping beyond the Forerunners' reach.[8] A few Precursors did indeed manage to survive the Forerunners' extermination efforts. They either went into suspended animation or became dust that would regenerate into their past forms when the time was right. However, time rendered the dust defective, and it only created sickness and disease. With this new form, (the earliest stage of the Flood), and embittered by the conflict with the Forerunners, the Precursors vowed that none of their creations would rise against them again.[9]

List of appearances[edit]


  1. ^ Halo: Silentium, String 15, page 181
  2. ^ Halo: Cryptum, page 342
  3. ^ Halo: Primordium, page 194 ("Long ago, when it became apparent that the Precursors were about to erase Forerunners, there was a war, and Forerunners erased them.")
  4. ^ Halo: Cryptum, page 203
  5. ^ Halo: Silentium, String 24
  6. ^ Halo: Silentium, page 14
  7. ^ Halo: Silentium, String 15
  8. ^ Halo: Primordium, page 364
  9. ^ Halo: Silentium, String 13