Halo (D20 Modern Campaign Setting)
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The Halo universe is the sprawling fictional universe in which all Halo media takes place. Many of Halo's central events are set in the 26th century of the human Gregorian calendar, with humankind colonizing the galaxy only to stumble upon a hostile alliance of aliens known as the Covenant, who, motivated by the power of the Prophets and the promises of paradise-after-death, are bent on humanity's destruction.