While reading your story I found that I could imagine the characters being human just as easily as forerunner. I know you want to make the connection, but you're portraying the forerunners in a very human way that doesn't do their mystery and their lore justice. I expected more from them, and your story didn't deliver. They just seemed immature for lack of a better word; ready to start their own genocidal war, which certainly doesn't help the galactic biodiversity that the forerunners practically sacrificed themselves for. Forerunners would have other, better ways of doing things. This wasn't helped at all by the lack of descriptive language.