When we found E-12, the twelfth inhabitable planet we discovered beside Earth, we thought it would be a near-idyllic place to build a new colony. It had very few warm-blooded animals compared to Earth, and the ones that existed only came out during the day time, but every planet evolved life a bit differently. Ten thousand people arrived early one morning and set about the work of building enough prefabricated buildings and equipment that they could survive the night. As soon as the night chill entered the air, though, the creatures came to the camp, seeking the heat of the buildings and the warm-blooded prey inside. They attacked every source of significant heat and only a few hundred people managed to survive the night.
We soon learned from the dead bodies of the creatures that they could see heat, though any temperature over about 10 C (50 F) would cause them pain. We also discovered that they were weak to energy weapons, but that those weapons drew them to you, and decided that the small number of warm blooded creatures were the result of their hunting.
Now we are fleeing them, living in caves to try and hide our heat at night, and only using electricity or heat-generating devices outside the cave during the daytime. Though they are weak to energy weapons, using them, or even firearms, to fight them is suicide, so we must fight them with non-heat producing weapons like bows, spears, and swords.
We soon learned from the dead bodies of the creatures that they could see heat, though any temperature over about 10 C (50 F) would cause them pain. We also discovered that they were weak to energy weapons, but that those weapons drew them to you, and decided that the small number of warm blooded creatures were the result of their hunting.
Now we are fleeing them, living in caves to try and hide our heat at night, and only using electricity or heat-generating devices outside the cave during the daytime. Though they are weak to energy weapons, using them, or even firearms, to fight them is suicide, so we must fight them with non-heat producing weapons like bows, spears, and swords.