Warhammer 40000: Core Book
The galaxy writhes in the mailed fist of all-consuming war. The Imperium teeters on the brink of annihilation, beset upon all sides by heretic warlords, daemon-summoning witches, and rapacious alien empires. The Great Rift sunders the void, a ragged wound torn through the heart of the Emperor's realm and bleeding madness and mutation across all.