Yengchuai (La'uo II) is the second planet from the sun of the La'uo system, Xi'an Empire (SaoXy'an). Partially covered with an ocean of lava, Yengchuai's surface is profoundly geologically active, and is thought to have survived a collision with a massive celestial body in the recent past. Between its lava flows, the Xi'an Empire has constructed heavy mining and construction facilities. Some of these are hard labor camps for Xi'an prisoners convicted of serious crimes. Sentient rights activists in the United Empire of Earth (UEE) frequently petition the government to reproach the Xi'an Empire over this practice.