I believe our "enemies" are just illusions of the traveler. The traveler probably is a planet eater, much like Galactus in the Marvel series. The traveler has leached onto the planet (silently hovering above the earth where it took it's last stand) and is sucking out what ever elements it needs for survival. But above all else, the Traveler is hungry for knowledge. After purposely killing off a majority of human life, it now has revived the best heroes and is sending them to hunt down the most sacred knowledge that the Traveler both created and destroyed. However, this theory doesn't explain why the traveler would destroy us then look for information, especially since it made most of our technological advances. This is why I believe the Traveler is looking for the one thing it has never been able to find, a soul. After amassing unfathomable amounts of intelligence, it still does not know what it means to be free. So it purposely puts humans through these trials as a study of what makes us tick and why we continue to face the darkness against all odds. Building off of this - The traveler made Exo's in a attempt to duplicate the presence of a free and independent living soul. I have no idea what to think of the Awoken though.