so I was thinking the traveler has been to a bunch of worlds, including the fallen's homeworld, even making the fallen guardians, but every time the "darkness" showed up it ran away. in the story it said that the traveler protected us from the darkness...what if it was crippled trying to run away so its only choice was to help us? what does it get out of helping us? it was hinted at that we are "food" for the traveler, maybe something like how either is for the fallen, as long as we use the light and fight and die for it maybe we generate some type of food for it? maybe its like the hive that need "destruction" to live.
We sure do seem to do alot of killing and murdering not just to protect our self's but the traveler. Calus does hit at something "stronger than the light" and it does feel like he is trying to recruit guardians and there was a rumor about a 4th "darkness" subclass coming up.
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Pretty sure Void is the 'darkness'. 'Void Light' as its called is oxymoronical, for lack of better term. When we are referred to as food for the Traveler, its a metaphor. The Traveler 'hungers' for the interaction it gets from Humans, and gives Humans the powers they have to protect themselves, because the Traveler sees good in them, I think. If the Traveler didn't offer the same thing to the Fallen, then the Traveler maybe didn't like them quite as much. The Fallen are a bit more hierarchical, and abusive even. They seem to value strength above all else, like much of the 'darker' races. Humans are supposed to be more noble. I think Calus has some truthful information he wants to share with us, where as the Speaker basically had 'white lies'. The Speaker really didn't even communicate with the Traveler, just spoke on its behalf, to give people a hopeful message. I think there is some debate about 'midnight exigent' and how Rasputin shot down the Traveler to prevent its escape. It may be precisely what happened, but I'm not 100% sure, there's some dispute and I don't remember the details.