August Sader came from a long line of seers and was one of the most powerful of them. He had the ability to see the future. He died tragically after the School Master's sudden attack. His half-sister was Evelyn Sader, who was the Dean for the School for Girls in the second book.
August Sader had grey hair and kind, hazel eyes.
August Sader was quite famous for one of his books, A Student's History of the Woods. He liked Agatha very much. He used to teach history in the School for Good, while his half sister, Evelyn, taught history in the School for Evil. However, after she was evicted from the school, August had to teach history in both schools. He has his personal gallery with paintings of the children who were taken away from Gavaldon.