Overlord Volume 09

The Magic Caster of Destroy is the 9th light novel volume in Overlord series. It was released on June 29, 2015. It details about the war between the Kingdom and the Empire is at its end. Ainz Ooal Gown enters the war and became known as the Magic Caster who destroys an army.

Short Summary
Every year, the annual war between the Kingdom and the Empire seems to be nearing its end, but the ruler of the Empire, Jircniv, also known as the "Blood Emperor", visits the Great Tomb of Nazarick and allies with Ainz Ooal Gown, which leads him to enter the conflict between the two nations, changing it into a total war.