*dem hashtags* [quote]What is the explanation of Master Chief receiving the gifts from the Librarian if she is dead?[/quote]At some point around the time that the Ur-Didact composed the humans of Omega Halo, most likely before, he sent out a call for all Prometheans to aid him at Requiem. One of the Prometheans that arrived was a female called Endurance. She was supposed to be the Ur-Didact's wife before he found the Librarian. Endurance was given some control over the operations at Requiem while the Ur-Didact carries out his plans. When the Librarian arrived at Requiem after following the Didact, she came across Endurance. She convinced her that the Didact was not well, and wasn't in his right mind. For the love Endurance had left for the Didact, she decided it would be better to help the Librarian to help the Didact. Endurance agreed to the Librarian's plans and she commanded the mechanized Prometheans under the Librarian's orders. In the mean time, the Librarian imprinted herself onto Requiem's systems to aid an protect Humanity once they found Requiem. [quote]Where is she, and if she's dead how is this happening?[/quote]She's just an imprint of her former self. Living memories essentially [quote]Promethean Knights were composed humans, but what are the Crawlers and Watchers? Their dogs and birds?[/quote]Unknown. We'll probably find out or get a further clue in the Halo 4 Visual Guide.