Ken to Honoo no Diazfeld III

is the third volume of the Ken to Honoo no Diazfeld light novel series, written by Kei Sato and Illustrated by PALOW. It was released under the Dengeki Bunko Imprint in November 2017.

Synopsis
The royal road fantasy war record where swords and flames are scattered, the third is an unparalleled heroic legend!

Rustat, the knight of Diasfeld, who was to go to the border conflict area far east as an escort for the Barbarian Emperor Diroke. On the way of a long journey around the vast territory, bandits, vicious Taishou, and heretical fanatics attacked one after another. As they scatter them and marvel at the culture and nature of unseen nations, Rustat touches the hidden mysterious roots of Alquilan in the depths of a dark cave. Ancient battles, ancient heroes, lost holy swords. And the legend of the old Alkyran revives with the young exotic knight Rustat! The legend of a new hero has already begun!

(source: Dengeki Bunko Official Website - Translated)