This isn't lore as much as a suggestion. What if there was a dlc or free update that would let you venture inside the traveler (to, say, eradicate a type of parasite like darkness?)? My highest level guardian is lvl. 20 so maybe there is. But there probably isn't. I really hope bungie looks into this concept. There could just be a lot of story potential in this.
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Posted about this idea ages ago, I'd done well it would make for a great mission.