Visp

Visp is a fringe world which was incompletely terraformed in a rushed attempt to make it habitable before it was reached by the Great Silence. The two towers that protect it are Lacola and Dacola, designed by Yallen to mask the signal of the alnen and civilization. The colonizing star ship that landed on it had a population that gradually forgot about its past, and devolved, creating an entirely new civilization from the ground up.