Hundreds of thousands of years ago, the Mantle of Responsibility belonged to the Precursors, who gave all life to the galaxy. However, the Precursors wanted to give such power, instead of to the Forerunners as originally planned, to the human race. In retaliation, the Forerunners drove the Precursors into extinction. Instead of fighting back, the Precursors let themselves die to their creations, turning into a dust to later become themselves once again. It spread like wildfire due to ancient humans rubbing the powders on their pets, believing it helped their pets to live longer. However, instead of helping their pets, it eventually infected and contorted them 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 then to a primitive civilisation based in Africa, and fought the Flood, which spread through an infestation of sentient life and had overrun 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 between the Forerunner's dictator known as the Didact, who wanted to assimilate all the humans on Earth into his army as AI's, thus immune to the flood, and his wife the Librarian, who created the Ark, an instrument which allowed 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, activated the Ark and disappeared. [1] Nearly a hundred thousand years later in the 26th century, humanity—under the auspices of the United Nations Space Command, or UNSC—colonized many worlds thanks to the development of faster-than-light "slipstream space" (i.e. hyperspace) travel. Tensions between the government and colonies desiring independence sparked violent clashes. The UNSC sponsored the SPARTAN-II Project to create an elite group of enhanced supersoldiers to suppress the rebellions covertly. In the year 2525, human worlds come under attack by an theocratic alliance of alien races known as the Covenant, whose leadership declared humanity heretics and an affront to their gods—the Forerunners. The Covenant began a genocidal holy war. Their superior technology and numbers proved decisive advantages; though effective,
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