An endless extragalactic swarm driven by the Hive Mind — they consume biomass from every world, leaving dead rock behind.
Books
James SwallowBlood Angels
Richard WilliamsTime of Ending: Chronology
Laurie GouldingTime of Ending: Chronology
Laurie GouldingTime of Ending: Chronology
Nick KymeLords of the Space Marines
Josh ReynoldsTime of Ending: Chronology
Nick KymeTime of Ending: Chronology
Gav Thorpe41st Millennium: Chronology
Josh ReynoldsTime of Ending: Chronology
Braden CampbellTime of Ending: Chronology
Laurie GouldingTime of Ending: Chronology
Guy HaleyTime of Ending: Chronology
C.L. WernerGenestealer Cults
Laurie GouldingSpace Marine Battles
Peter FehervariGenestealer Cults
Dark Imperium: Chronology
Dark Imperium: Chronology
Dark Imperium: Chronology
Adrian TchaikovskyGenestealer Cults
Darius HinksDark Imperium: Chronology