What happened to the brother of Central Asia in Battlefield Valkyria 2?

In order to protect his brother and mother's hometown, yabang's brother Leon participated in the "Artificial Valkyrie" project, equipped with artificial Valkyrie armor, and became an artificial Valkyrie. "Man-made Valkyrie" armor has side effects: it stimulates the user's brain greatly, and even makes the user have a nervous breakdown (just like Lyon), so Lyon is equivalent to becoming a war machine (as for why I went to the Imperial Army, I'm sorry I can't find a clue). Later, Arias broke it, regained consciousness and finally died in his brother's arms.