Manchest

Manchest is a planet with a dense fog, the fog was created when a science experiment backfired, before the experiment backfired though, a couple of robots had buried treasure inside ancient temples deep underground, then they went back above ground and pretended nothing happened, this legend was passed through generation through generation and no treasure hunter had found the entrance to the caves which lead to the temples. Then the science experiment backfired and fog appeared, dashing everyone's hopes of finding treasure. Because it was so hard to see, creatures moved to Manchest's moon, Nit, which was half of Manchest's size. No one has ever gone looking for the caves because of the fog.