Silentium

In the final years of the Forerunner empire, a horrifying parasite known as the Flood, aided by unexpected allies, brings chaos to the galaxy. As internal strife weakens their defenses, agents investigate potential crimes by the Master Builder and others. The Librarian and both Didacts reveal ancient secrets about the Precursors and the Flood, facing the imminent collapse of their civilization. One of them must commit an unthinkable act to prevent an insane evil from dominating the entire universe.