The planet's surface has been scorched by the nearby sun's extreme heat, which allowed for underground tunnels to form with lots of priceless Crystals. It's very hot on the surface, but deeper into the tunnels it gets cold enough for life to be able to withstand the heat. The planet still has visible traces of an atmosphere, but it is likely very thin and made out of stuff like carbon dioxide.
Some plant life was able to persist deep within the tunnels. More complex life forms also are possible, as proven by the mysterious Heart of Darkness appearing in here.
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