By the Grace of the Gods: Volume 14

To prepare for the journey into the Sea of Trees of Syrus, Ryomas 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 Ryomas knowledge of Earth, he manages to invent a new spell. The group also makes an unexpected discovery under the citys tower-a massive pocket of magic crystals! Ryoma starts mining them, but he finds something else that would surprise even the gods themselves...