The Faraway Paladin (Manga) Omnibus 6

Contains the Complete Volumes 11-13!Will and his allies have reached the Rust Mountains, and it’s at last time to avenge the people of the Iron Country. They journey to the Rock Hall, meeting up with those who stayed behind to defend their home. It’s time for Al to step up and see their souls off to the great beyond—as befits the descendent of Aurvangr, king of dwarves. When the group reaches the throne room, they’re confronted by a Scarabeus, which has claimed the dwarf crown for itself.

Yet the roach-like creature is the least of their worries, for behind the creature lurks an even greater predator, ruling supreme over the Rust Mountains... A fierce battle awaits for those who seek to reclaim the Rust Mountains, and it’ll take all their resolve and cunning to seize victory!