Fallen Imperium

It is the 43rd Millennium.

There is only betrayal.

Since Roubute Guilliman's fall to Chaos and the toppling of Terra as the birthplace of mankind, what remains of the Imperium has fallen into shambles. Entire worlds have fallen to the great enemy. In the Eastern Fringe, the Tau takes advantage of a lack of coordination in the Imperium and takes entire sub-sectors worth of space for their empire. Elsewhere, the Tyranid and Ork threat advances. In the span of a few decades, what space the Imperium has is reduced to a tiny portion of what it used to be.

However, not all hope is lost. The forces that managed to recover from the initial shock also managed to consolidate and maintain control of multiple sectors along the core of the Milky Way galaxy. In addition, alliances were struck between these remnants, the Aeldari and the less corrupt Necron dynasties. Surviving humans and other species that didn't want to turn to Chaos are freely able to flock to the systems that the Remnant holds.

Officially known as the Resistance, they have no hope of continuing the Great Crusade and defeating Chaos. But they can make their safe haven a home for their eventual extinction.