Was there a novel describing the children of high-ranking officials in the Corps Prison?

I recommend " The World-toppling Army ". This is a fantasy novel about swords and magic. The main plot is about a young man who has been bullied. He gets the sword of the king, gathers talents, recruits soldiers, and buys horses. He builds a powerful army. The terrifying and cold army thus appears. Later generations call it the Death Army. The reason why this book was recommended was that it described the elements of the corps and the prison, which gave people a visual impact and shock. I hope you like my recommendation.