All these forces of Darkness and you mean to tell me there isn't a single world out there that serves the light through a different way? If there are manifestations of the Darkness like the Black Heart, then is it reasonable to assume there are manifestations and creatures of the Light? Since the Traveler isnt the source of all Light, then surely there are other ways to it? I really hope Bungie introduces a light race that is running from the Pyramids but then detects new light and finds us. It's just silly to have every race we encounter be hostile. I'm hoping there are surviving Ammonites who once wielded the Light and an expansion based on looking for new light sources.