First-Light-Weaves-Living-Song, more commonly known as The Librarian, was a Forerunner who served as the Lifeshaper (leader of the Lifeworker caste). She sought to document and index all sentient beings of the Milky Way and protect them from being absorbed into the Flood by sending them to the shelter of the Ark. Of all the races she indexed, she deeply respected Humanity, whom she viewed as "special" among all of the sentient life she had seen: she felt that saving them was well-worth dying.
- The Librarian is the wife of Didact. She was the one who imprisoned him in the sphere long ago.
- The Librarian serves as an AI in Darkblade's Super Computer and helps out with certain things.
The Librarian can help out any crossover team if they need help.
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