[quote]Revived LoA? Isn't that Guilty Spark/Chakas?[/quote]It seems the Lord of Admirals was not imprinted on just Chakas. When the Librarian was on Earth, the Gravemind sent down humans with ancient human geas. However, they were severely distorted to look like the geas they were imprinted with. [quote]Pre-echo? What's that?[/quote]Halos fire supermassive neutrinos at infinite speeds. Because they travel faster than light, the traces, or echo, of the Array being fired can actually be detected before the Array is fired. Meaning that if the pre-echo is detected, it is absolutely inevitable the Array will be fired. [quote]So how do we and the characters of Halo have so much information about the Forerunners if their life was destroyed?[/quote]343 Guilty Spark, Catalog's deceased body, and the Bornstellar-Relation found on Trevelyan. Keep in mind what we know took decades to discovered and is disputed. And even then, we only know an incredibly small fraction about the Forerunners.