The Faraway Paladin Novel Volume 3.5: The Lord of the Rust Mountains: Secundus is a direct continuation of Volume 3 and was written by Kanata Yanagino and illustrated by Kususaga Rin.

Though wary, Will and his allies at last set upon the forbidding Rust Mountains where the foul dragon Valacirca awaits. A bloody battle is all but certain, and words of warning come from every direction imaginable—including from the god of undeath.

Yet not even a nostalgic reunion can deter Will. He means to stay his course and fight. Thus the curtain rises on a tense clash in the lost underground kingdom... Is Will strong enough to hold his own against a dragon feared by even the gods, or will this be the Faraway Paladin’s last stand?