The Strange Adventure of a Broke Mercenary (Light Novel), Vol. 9

Having made it to Lapis's home, Loren finds himself tasked by her mother, Demon Lord Judie, to destroy a dangerous artefact by throwing it into a nearby volcano. Unfortunately, an old foe has his sights on the artefact in question. And as if that wasn't bad enough, the volcano just so happens to be occupied--by an ancient dragon!