Which one of these would you like to see added into the game? If you haven't read up on the grimore of these planets, please do before voting.
Edit 1. If your choice is a satellite of one of these planets (such as a moon) then choose the planet it revolves around. (ex. Titan, Saturn's orbit; Europa, Jupiter's orbit)
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Considering Jupiter and Saturn have no solid actual surface. It would have to be natural satalites or space stations. There are already some Mercury PVP maps in the game so that is the most likely choice