Spawning pool

"Do not pee in the Spawning Pool."

- Phill Gonzales The zerg spawning pool is a pit of primordial ooze in which is contained the genetic makeup of the zergling.

StarCraft
The spawning pool gives larvae the ability to morph into s and the hatchery the ability to evolve into the lair. The spawning pool is also responsible for evolving the zergling with Metabolic Boost (faster movement) and Adrenal Glands (faster attack).

StarCraft II
The spawning pool reappears in StarCraft II.

Development
The spawning pool was visually updated during the first pass of creating final artwork for StarCraft II. The main difference was artistic direction asking for a single large pool rather than the numerous smaller pools seen in the original game. The beating heart in the center was an afterthought to make the design more interesting. It was desired that the intestines have a more "veins pumping look" but the water obscured it too much for this to be implemented.

The research to unlock the ability for zerglings to morph into banelings was once possessed by the spawning pool.