Gravity that one's easy, with the traveler came technology with technology came terraforming (make other planets livable to us carbon based lifeforms) but also with technology came the gravboot, the gravboot simulates near Earth gravity except in the situation of our special jump ability it slightly reverses gravity giving guardians lift instead of constant footing. That explains the whole gravity thing.
Drunk sparrow driving, there needs to be no test because what's the worst that you could really happen, you run over a cabal and accidentally back over him trust me you'll be forgiven.
As far as everything else goes you're on your own.
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trees are all dead on mars, how does the cabal get so big and bulky? i guess they must have mad protein shakes there
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See the cabal aren't from mars they took it from us during a great battle they're from a high gravity planet which is why they're bigger and "stronger" than we are which also explains all the armor they wear, when you get a head shot you notice the dark spray that happens, that accures when matter on the inside rush outwards due to less gravity. Their body is fight its self on a planet with less gravity than theyir home planet constantly pulling outwards until you pop the top and let physics take hold