But there was still some time until the sunlight completely vanished at the horizon.
Xiao Yi learned from the doctor that although the Night Demons were formidable, they had a fatal weakness, they feared sunlight.
Even a tiny bit of sunlight could cause them immense pain, and a stronger ray could even kill a Night Demon directly!
Because of this, the survivors discovered that ultraviolet light made the Night Demons uncomfortable and fearful, allowing them to dare to move around at night.
Of course, Night Demons wouldn't appear on cloudy days either because the sun hadn't disappeared on such days, it was just obscured and not as intense. Without sunlight, the whole world wouldn't just plunge into darkness, it would be utterly destroyed.
However, strangely, Night Demons were not afraid of moonlight. What exactly they feared in sunlight remained unclear.