"""Speaking of Shadow Demons, Kapei remembered that since the early days of the Research Institute's establishment, they had dealt with them for a long time.
These creatures were nearly invincible in darkness: you didn't know when they arrived or when they left, or who they had killed before departing. It was only during the daily roll call that everyone suddenly realized someone was missing, and they understood that another person had fallen victim to a Shadow Demon's stealthy assault.
At first, experience showed that Shadow Demons feared light: they seemed only able to move in darkness, so the Research Institute set up lighting equipment that stayed on 24 hours along the main corridors.
However, it was to no avail; people still went missing every day.
According to closed-circuit surveillance footage, these monsters would mysteriously "spawn" from dark rooms within the base, even if the rooms were completely "sealed" by light sources.
