We really do not know what the Traveler did with other civilizations. The only real record is from Fundament where the Traveler remained until the Ammonites had been totally destroyed before leaving. A flavour text on a weapon is meaningless without context for the Fallen. Secondly there is no evidence that the Traveler made Fallen Guardians. The reason the Traveler remained, and yes we know it chose to stay, was because it had a vision when approaching our solar system, a vision that filled it with hope. Lastly on the nature of the Traveler we have the Books of Sorrow [quote]++We live on the edge of a war— —a war between Formless and Form++ ++between the Deep and the Sky— ++MY EYES ARE WIDE, MY GAZE IS LONG++ —Across the universe, as far as I see++ ++the Sky works to charge its fires— —and the Deep drowns the ash++ —Sky builds gentle places, safe for life++ ++Beloved Fundament, refuge of trillions— —The Sky treasures this rich place++[/quote] and [quote]++The Sky builds new life++ —Against the onset of ruin— ++Towards a gentle world++ —The Deep embraces death— ++Saying: this is inevitable and right++ —I exist as hungry ruin— ++TURN BACK FROM THE WORLD-KILLING WAY++ ++OR YOU WILL LIVE AS DEATH AND DEVASTATION++ —The Sky is the harder way. But it is kinder.— —My charge is balanced: my voice exhausted.— [/quote] The Traveler is synonymous/represents the Sky, The Darkness the Deep. The last warning became true of the Krill, they became death and devastation under the Deep/Darkness as the Hive.