The Beamon nobles from the surface began to notice a peculiar thing. Whether it was a coincidence or not, as they journeyed from place to place, they discovered that in the sky above each hill inhabited by a Cave Dweller was suspended a "Underground Sun" covered in crows that cast fluctuating gold and silver radiance.
Only after asking Xiao Cui and Elder Tang Jin, Liu Zhenhan discovered that without the rays of this Underground Sun, crops of the underground—Hidden Flower Moss and Snakeberry Bush—couldn't grow. The vegetation here also needs weak photosynthesis. Any inhabited places in the underground select regions illuminated by the "Underground Sun" because only areas where plants grow will dissipate the toxic gases spewing from underground cracks. Apart from the River Immortals, no one enjoys staying in the dark for long. Even the Drow Elves dislike "pure darkness".
