I know we have no idea what the factions represent or their role in the game, but what do you think they mean.
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Well a quick googling of Seraphim turns up this: "Medieval Christian theology places seraphs in the highest choir of the angelic hierarchy. They are the caretakers of God's throne, continuously singing "holy, holy, holy"." -Wikipedia So, we could take that to mean that they consider themselves the caretakers of the Traveler. Also, I think that they may be the air superiority due to Seraphim being angels, which, hopefully you all know come from Heaven(or the heavens[space]).