Traveling Through Another World and Encountering Natural Disasters of the Undead

When you travel to another world, you will encounter a natural disaster of the undead. The city was filled with corpses, the living turned into monsters, and the kingdom fell within a month. Rhodes was lucky enough to meet the last survivor of the royal capital - the little princess who had just transformed into a vampire, and her knight guards. In order to survive, Rhodes decisively begged the princess to turn himself into a vampire. From then on, the trio struggled to survive in the ruins of the zombie tide. But Rhodes soon discovered that there were crystal nuclei in these corpses, and they could evolve after eating them. He had read this plot in no fewer than fifty novels from his hometown.