The extractor is a Shroud structure that collects catalyst. Unlike Human and Beta extractors, the Shroud's extractor does not require a refinery. It simply mines catalyst at a constant rate, and adds it to the player's catalyst total.
Shroud extractors can "undeploy" which stops collecting resources, and allows them to walk around. The extractor can re-deploy on any catalyst pool and continue harvesting.
See also
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