The Zerg is a playable race of many different species, assimilated into the Swarm over time. Zerg units are individually weak compared to the other races' units, and so are massed to be effective. All Zerg units and buildings are living Biological organisms, and always regenerate life at 0.273 HP/sec. Zerg buildings must be built on Creep, which is mainly produced by the Hatchery and Creep Tumor. Zerg ground units move faster on Creep. If the Creep is removed from a building, it will lose 2 HP/sec until it is destroyed or Creep is restored. Zerg units are morphed from Larva or other Zerg units instead of built from many different buildings like the other races.
The zerg are a race entirely unlike the terrans or the protoss. They are composed of many different species integrated into the Swarm via zerg infestation. These creatures are rapidly and selectively evolved into deadly and efficient killers to further drive the zerg imperative of achieving absolute domination. The zerg make no use of technology to create their weapons, armor, or starships. Instead, these functions are efficiently fulfilled through biological adaptation and planned mutation of the zerg strains. Even zerg buildings are in fact specialized organs within the living, growing organism of a zerg nest.
Although the Overmind was primarily driven by its desire to consume and assimilate the advanced protoss race, it found useful but undeveloped material in humanity. Taking a powerful terran psionic, Sarah Kerrigan, the Overmind evolved a new and unique creature: the Queen of Blades. When the protoss destroyed the Overmind during the invasion of Aiur, the Queen of Blades manipulated the dark templar into eliminating the surviving cerebrates. As a result, she came to dominate the Swarm.
For a more complete look at the history of the Zerg, check out the extended Zerg History page.
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