As the third expansion to the acclaimed RTS, Warhammer 40,000: Dawn of War, Soulstorm (2008) requires the base game to play. It significantly enhances strategy by adding two new factions—the Sisters of Battle and the Dark Eldar—and introducing aerial combat units for all armies. The core loop expands the conquest meta-game to an interplanetary scale, letting players vie for control across multiple planets and moons. Hero customization and army personalization options are also deepened.
Representing the Chamber Militant of the Emperor’s Holy Inquisition, the Sisters of Battle are presented as an elite fighting force. Their units emphasize powerful close-quarters combat, featuring specialized troops like the Sisters Repentia and heavy support from constructs such as the Penitent Engine.
The twisted and swift cousins of the Eldar, the Dark Eldar are characterized by their reliance on speed and devastating raids. Their gameplay focuses on rapid strikes, close-quarters engagements, and utilizing abilities that can stun or poison enemies before retreating.
The revolutionary meta-game system first introduced in the previous expansion is taken to an interplanetary scale. Players now engage in strategic warfare across an entire solar system, which includes multiple planets and moons that must be conquered, enslaved, or destroyed. This significantly expands the strategic layer beyond single-map skirmishes, offering a larger campaign map structure across 34 available maps.
A major addition to core gameplay is the introduction of strategic air units for every army. This allows players to bring death from the skies, adding a crucial vertical dimension to tactical engagements across the battlefields.
The personalization of forces is deepened through hero customization. Players can now upgrade their heroes by selecting specific weapons, items, and abilities as they gain power. Furthermore, armies can be visually customized with unique insignias, colors, and banners, alongside the ability to earn and unlock achievements and medals for online superiority.
This content functions as an expansion, building upon the established RTS foundation of the parent game. It maintains the core real-time strategy genre while integrating the new factions and expanded conquest mechanics seamlessly into the established universe.
The primary new mechanics involve the introduction of aerial combat units for all factions and the expansion of the strategic meta-game map to encompass an entire solar system, requiring conquest across multiple celestial bodies.
As of the current information, there are no additional DLCs or further expansions released for this specific title beyond this content.