C1400 The Little Grief of Happiness

"My god, this thing is really magical. It's practically a treasure all over." More importantly, with the essence of this Heavenly Calamity Mine, we can actually turn ordinary sand into Heavenly Reef. This is way too amazing. If that's the case, then we won't have to worry about dealing with the sand in the future. "The incomparably vast desert is our ideal energy source