Obviously Ghaul took those like he took our light. Those still exist but you need to kill Ghaul to get them back.
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He didnt take away your light he severed the connection to the traveler and booted you off his ship
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I believe he did but I also believe he underestimated the Traveler. I am thinking that this time around the Traveler is more awake then before and noticed what Ghaul did. The Traveler still could give us access to the light because that device couldn't really cut off all of the Traveler's light. But that is just a theory of mine. I am hoping it's true.