The magnetic fields of Planet Eclipse were a mess. There were frequent magnetic storms, so most tools did not work there. And there were many mountains on the planet, which rendered its landscape a complicated one. It was a harsh place to live.
Many years ago, an Earl had earned permission to develop this place. He built a base in a region known as Mirror Lake, and using that place as a hub, he went out and killed many xenogeneics.
But in under a month of being there, the Earl led an expedition into the mountains and never returned. Not a single one of those members had come back breathing.
The Rebate, of course, sent others after them to pursue an investigation. One Duke spent months in the mountains, searching for what might have become of them, but he found neither hide nor hair of the Earl and his team. He eventually had to stop.
Ever since then, no one had wanted to go to that planet.