Who is Grave Robber's Chronicles?

The little brother in Grave Robber's Chronicles was a fictional character, one of the main characters, and a mysterious character who often appeared in novels. The little brother's identity is mysterious. Some people say that he's an immortal, some say that he's a demon, and some say that he's an ordinary person. He was very powerful, able to use all kinds of magical weapons and skills, and could control life and death.