Huraian
The end of the RAL began when the aliens realized that their hope to survive and their growing rebellion of the Amazonian tribal natives was causing them to question their presence on the ice blue planet, we call Earth. When the hominid interlopers came down the vertical cave that the aliens left behind, they encountered a Terranau beast that would kill the intruders at the great circular wall, before they found out what happened to the RAL Empire.