Another few things to note is the archive and library both have markings similar to the "Mark of The Hidden" that Eris and Ikora use as their "secret" group of Guardians. Doing the jobs that the other members of the tower deem either crazy, to dangerous, or betraying the sanctuary which the traveler has made for us. What that might mean I'm not sure but several people have been trying to put more meat on the bare bones of the story we're given.