Beastmen was one of the special races in Stellarsky Domain. Its population was quite big, and it was probably one of the strongest among all special races.
In ancient times when the human race had not risen yet, the demon race dominated the world. They were barbarous and lustful. Many powerful demon races robbed females from the human race and forced those ladies to mate with them and give birth to their next generation. Among their descendants, some inherited the demon race gene and became demonic beasts, and some inherited their mothers' genes and became pure human. Most of them inherited genes from both of their parents and possessed traits of both the human and the demon races, becoming beastmen.
Years after years, generations after generations, beastmen evolved and finally became a special race themselves. Since they inherited the lustful gene from the demon race, the beastmen race reproduced very fast and expanded in size quickly.