Crusade Mission Pack: Containment is a narrative play expansion for Warhammer 40,000, set in the Octarius Sector.

This region of space has been a tinderbox for many years – one which the citizens of the surrounding Imperial worlds prayed would never ignite. Within it, Tyranid swarms and Ork hordes beyond count now fight each other to a bloody standstill on scores of worlds, yet each grows stronger despite the bloodshed. The Tyranids of Hive Fleet Leviathan have glutted themselves on vast quantities of biomass, while the Orks become larger and more warlike with every brutal conflict they survive. The stage is set for an apocalyptic showdown.