Leord from Starcraft 2 IncGamers wrote a short editorial sharing some details of the Overseer. Also take a look at the IncGamers Starcraft 2 Wiki

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Blizzard has added a new planet bio, Char.
Char was formerly one of the thirteen core worlds of the Confederacy, but it is most notorious as the primary hive planet of the alien zerg. Upon its discovery, Char was found to be an inhospitable volcanic planet with thick ash covering most of its surface and tainting [...]

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