The living habits of alien races were weird. Apparently, there were aliens who had been allocated dormitories but were not accustomed to human accommodation. They built basements and tree holes everywhere, creating a mess. In the beginning, the higher-ups of the Holy City had adopted a compulsory assimilation policy for these aliens. However, accepting Holy Apprentices of alien race origin was a new thing to the Holy Land too, and they needed to further experiment and observe how things went. They realized that it was far more important for the alien races to identify with humans rather than force them to adapt to the human way of living. The latter matter seemed too urgent and caused the alien races to develop an aversion towards humans instead; so they eventually did away with the rules that forced these aliens to live in human buildings.