Duan Surk II (10) Ochita Yuusha (Part 2)

is the tenth volume of Duan Surk II and the eighteenth volume overall of the Duan Surk light novel series, written by Mishio Fukazawa and Illustrated by Sunaho Tobe. It was released under the Dengeki Bunko Imprint in November 2007.

Synopsis
Duan is being eroded by the dark demons that have entered her body during the battle with the "faceless person" over the heavenly fire in the ice and snow forest. He finally had a daydream trying to stab King Lonza with his sword, and fearing that he would harm his surroundings, Duan left Romeria alone and was heading for Opal. However, Agnes, who looked down on him, chose to go out with him without knowing his circumstances. Then, the journey of the two began, but an unexpected incident occurred at the destination ...!? Can Agnes save Duan from the hands of the dark demons !?

(source: Bookwalker JP - Translated)