The Maelstrom is a turbulent warp storm and region of corrupted space situated toward the galactic center, a churning tempest where the immaterium bleeds into reality and reality is torn apart in turn. Though smaller than the Eye of Terror, it is no less dangerous, a swirling expanse of unstable stars and daemon-touched worlds that has long served as a haven for the enemies of the Imperium.
Within and around the storm lurk pirates, renegades, and warbands of Chaos Space Marines, who use its unpredictable currents and hidden systems as a base from which to raid Imperial shipping and nearby worlds. The chaotic nature of the region makes it nearly impossible to police, allowing all manner of outlaws and cultists to flourish beyond the reach of Imperial law.
The worlds caught within the Maelstrom's influence are frequently warped by proximity to the warp, their populations preyed upon or corrupted over the centuries. Efforts to pacify the region have consumed countless lives and rarely achieved lasting success, for the storm's boundaries shift and its dangers multiply. A festering sore of piracy, heresy, and daemonic incursion, the Maelstrom remains one of the most lawless and perilous frontiers in the galaxy.