If I remember correctly, the Eliksni came in peace and tried to join the humans but the humans after the collapse did not ask for intentions and attacked directly. On the other hand, the humans were not chosen, the traveler gave them the light when he was weakened after being forced to fight against the darkness and needing guardians to protect him, his original plan was to leave the humans as a decoy while he escaped from the darkness. but raputin prevented it
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They’ve never really shown first contact and it wouldn’t of been universal. Pockets of humanity struggling to get by would be hostile to an unknown alien species coming to them. They just got attacked by aliens after all. The closest we got was when they took a Speaker to talk with him. It’s kinda weird how that moment didn’t lead to some sort of talks, they let him go back to the City after all. Rasputin didn’t wound the Traveler. That was a plan it made in case it tried to run. Traveler lore cards showed that it didn’t intend to run, it was going to make its stand with us. We know the Traveler started fighting, that’s how the Awoken were made.