This article contains spoilers for Halo episode 2.
Paramount+'s Halo TV series has made a massive change to who can activate Forerunner artifacts, and therefore, changed a part of Forerunner-Human lore. In general, Paramount+'s Halo TV show has actually been a remarkably faithful adaptation of the source material. But the so-called "Silver Timeline" is still different, though, not least because the Master Chief commands Silver Team in the show rather than Blue Team. Probably the biggest change to date is in terms of just who can use Forerunner technology.
Halo's central concept is that, millennia ago, a powerful race known as the Forerunners created the ancient Halo Rings to wipe out all life in the galaxy — a last-ditch attempt to destroy the food source of a parasitic infection known as the Flood. Humanity is a survivor of this ancient cataclysm, and the Forerunners programmed human genes with what they called a "geas," or "genesong," granting every human being the ability to use their technology. The alien Covenant may venerate the Forerunners, but only humans can use their artifacts.
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But the Halo TV series seems to have switched this up. In Halo, not all humans possess the Forerunner genesong allowing them to become what the Covenant and their Prophets call "Reclaimers." Rather, the Covenant has learned only a minority of humans can activate Forerunner technology; to date only two have been identified, the Covenant's Blessed One Makee and the Master Chief himself. It's unclear whether the Forerunner genesong has been diluted in most humans, or whether there's something unique tying these two characters together. In an interview with Decider,
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