By the Grace of the Gods: Volume 14

To prepare for the journey into the Sea of Trees of Syrus, Ryoma s hard at work grinding his adventurer rank. He and his companions decide to clear out the Undead-ridden City of Lost Souls on the way, and thanks to Ryoma s knowledge of Earth, he manages to invent a new spell. The group also makes an unexpected discovery under the city s tower a massive pocket of magic crystals! Ryoma starts mining them, but he finds something else that would surprise even the gods themselves...