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"Genie", a mysterious entity that had begun to roam the Ankh Desert a hundred years ago. Many had connected the many disasters that had begun to appear to him. Apparently, it was said that he brought plague upon the plantations of the various villages and cities of the desert, bringing an enormous army of giant locust monsters that started devouring all the crops. It was also said he strengthened the power of dungeons and made monsters break out of their dungeons, invading nearby towns. And even it was said he provoked Sandstorms and the fury of the Desert Kings, who were often very peaceful monsters that lived within their territories and didn't bothered to hunt humanoids, as their preferred diets were big monsters such as sandworms.
Check "The Protagonist's Sister Is Actually the Strongest"!