halo lore: Many years ago, a species known as the Precursors assumed the Mantle of Responsibility - the guardianship of life in the galaxy. The Precursors chose an ancient form of humanity as their successors, over another species known as the Forerunners. In retaliation, the Forerunners attacked their former masters and drove the Precursors into extinction. Instead of fighting back, the Precursors allowed themselves to die, with some turning into dust intended to spread and later transform into themselves once again. This dust eventually became defective, infecting and contorting organisms into a new parasitic species, connected by a hivemind to the minds of the last Precursors: the Flood. The Forerunners sent the humans to Earth, reverting them to a primitive civilization based in Africa, and fought the Flood, which spread through an infestation of sentient life and overran much of the Milky Way Galaxy. Exhausting all other strategies, the Forerunners conceived the Halo Array— ring-shaped megastructures and weapons of last resort that would destroy all sentient life in the galaxy to stop the Flood. A civil war began between the Forerunners' commander, known as the Ur-Didact, who wanted to assimilate all the humans on Earth into his army as AIs, thus immune to the Flood, and his wife, the Librarian, who created the Ark, an instrument that was to shelter sentient species outside the galaxy and allow for the mass creation of Halo installations which could all be activated simultaneously. The Librarian, along with all the remaining Forerunners, trapped her husband inside a Forerunner repository of knowledge known as the Domain, and disappeared as the Array was activated, thus destroying all sentient life in the galaxy and ending the outbreak of the Flood— though some Forerunners are known to have left the Milky Way galaxy for a different, unknown galaxy.
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