Xiodulus Azengud, the Demon King of Necromancing, was a demon born into a human family due to a curse that affected his father's family, named after the original Demon King Fendor Yemunat. This curse, the Yemunat curse, was created by Fendor to punish the King of Necromancing, but Xiodulus's father's generation accidentally got involved. The cause of this involvement is unknown; however, it is said that the Necromancing King Amezemtan deflected the curse onto a random family, stipulating that in a random generation of the cursed user's family, a demon would be born destined to kill the King of Necromancing, Amezemtan. That demon was Xiodulus.

Now, how did he become the Demon King of Necromancing? We will find out as the story goes on. Xiodulus killed Amez once. After that, he learned about the curse that the Demon King Fendor inflicted on his family, leading Xiodulus to kill the demon king himself and acquire the powers of both of them. The cause of this transformation is unknown, but it's said to be due to the curse that Fendor placed on him.

Now Xiodulus is the Demon King of Necromancing. However, the original Necromancing King Amez has returned to kill him, as he wasn't completely killed; his body was just destroyed. Amez created a body out of shadows and sought revenge on Xiodulus. He decided to kill him, but Xiodulus was nowhere to be found. It is seen that Xiodulus was cursed by the necromancers and the demons, so he disappeared out of this world.

"So, you reincarnated as a cashier working at a convenience store?"

"Yes," replied Ian.

"Woah," *laughs*. "You're one heck of a storyteller, man."

"Just trust me," replied Ian.

"Alright, so just continue the story."

As we get to know, due to the curses of the demons and necromancers, he accidentally activated a teleportation spell. But Xiodulus could still feel the presence of Amez on Earth, though he couldn't do anything. Amez felt his presence in another timeline, on another planet, in a different galaxy. So Amez tried to teleport, but something was blocking him. He tried again and again until he ran out of magic. Once he ran out of magic, Benzema, his brother who was envious of him, sucked out his last bit of magic. (There's only one way to kill a necromancer: by draining their magic, which only Dark Mages can do. Dark Mages are basically Necromancers but work for the Demon King.) Benzem, jealous of Amez, went to the Demon King Fendor and joined him as a Dark Mage and learned his ways. Fendor really liked him, so one day, Fendor called Benzem and asked him to take over as the Demon King and to destroy Amez. Benzem agreed, and right as Demon King Fendor was about to be dethroned, he was killed by Xiodulus, and Benzem fled the scene. Now, he wanted to take revenge for the demon king.

As Benzema was planning his revenge for the death of Fendor, he was notified that his brother wasn't dead. His brother used the shadows to create a savage body with a dark aura. Benzema, wanting to beat his brother, rushed his plans and gathered every demon and Necromancer in the world. He ordered them in the name of his brother and Fendor to curse and kill Xiodulus. As everyone's cursed energy was releasing, Xiodulus felt it. While trying to activate a curse-repelling spell from the Necromancing scroll, he accidentally activated a teleportation spell and teleported to Earth into a different body. However, he could still access his powers, talk with the dead and shadows, control the elements of Earth, and he's also a psychic too.