SPOILER WARNING Is it possible that the reason so many species dislike the Traveler because the Traveler had protected them as it did humanity? Though, one day it just up and left leaving a hole in the other species civilizations? Like the Fallen they seemed to be a strong and amazingly intelligent race, but in game shows them to be more barbaric. Grimoire cards also add on that they are indeed intelligent and have notions if loyalty and above all Nobility. It might be possible that the Traveler had once visited them and for unknown reasons left. Which caused them to 'Fall'