Think about it!
What does the traveller spread and give? Little balls of light called ghosts, or "little light" to those not under the travelers influence. Ever look at a ghost? It's shape? Attach a stick to it and what do you have!? A morning star!!
Satan, also known as Morning Star, bearer of light.
The traveller is Satan!!
What are we then?!! Possibly the other fallen angels. We fell and had to be brought back by satans light. That's why we wake up after being dead for x years with no memory of anything. He's searching for his faithful follows to bring back to life and help him again in his fight!!!
Traveller = Satan.
Edit: spread the truth guardians!! All most know of the dark deeds we are doing!!
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No, the Traveller is a UNSC Trojan Horse. [spoiler]any day, Spartans could come pouring out, to take over the City[/spoiler]