Halo : silentium
by Bear, Greg, 1951- author.
Summary: Facing the imminent collapse of their civilization, the Librarian and the Ur-Didact reveal what they know about the relationship between the long-vanished Precursors and the Flood. Facing the consequences of a mythic tragedy, one of them must now commit the greatest atrocity of all time -- to prevent an insane evil from dominating the entire universe.
Series: Bear, Greg, 1951- Forerunner saga ; bk. 3.
Publication Year: 2013

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