Within the Leon Region, there are no more than 350,000 people, of whom over 300,000 are slaves, with more than 250,000 being Half-Beastmen slaves. Hundreds of mines are scattered throughout the entire Leon Region. To extract the maximum value from the slaves, the Nobles have adopted various methods to increase labor intensity. The slaves work for over twelve hours every day, and to save expenses, the terrible working conditions in the mines leave the safety and health of slaves with no guarantees. Each month, the number of slaves who die from mine collapses and water leaks surpasses a hundred, and even the robust Half-Beastmen slaves can only work in such conditions for three to five years before becoming extremely weak, while it is rare for Mortals to last more than three years.