Crystal Extractors are an empires way to produce crystal for their empire
Crystal Extractors are the primary source of all crystal production for the various races empires. Extraction rates can be improved through research, and through allegiance increase. Neutral extractors have a set extraction rate that cannot be changed. Researching Communal Labor will help quicken up the construction of extractors. Also the Advent get culture earlier than the other races meaning allegiance gain will effect Advent extractors earlier than the other races should Temples of Communion be built early.