The mystical Kingdom of Magicula.
A land rich in magic, both in its inhabitants as well as its soil, with all kinds of species living together. Despite this, the current rulers of this land are humans—King Isaac and Queen Aribella. Under their rule, the kingdom has thrived and even expanded itself.
However, their rule was not a gentle one, and during their campaign to expand the kingdom's territory, they made many enemies from different nations and tribes. One of these was the Witch Tribe, from whom they seized many territories by force, killing many of their people in the process. The Witch Queen, furious at the loss of their daughters and sisters, decided to repay the rulers in the worst way possible—cursing you, their firstborn, with an incurable disease.
Your parents desperately sought the aid of the best healers and alchemists in the land, but it seemed that nothing could cure the disease that plagued your lungs. Then, when you were three years old and all specialists had given up on you, your parents, in a last desperate effort, decided to visit a shrine said to belong to a fragment of the god who created the universe itself—YihYahg. Praying to the amorphous being of nine eyes, the entity, perhaps out of amusement or pity, decided to grant their wish, binding itself to you and making you its host, stopping the disease from progressing.
However, its blessing would soon reveal itself to be something else, for its protection took a turn no one expected. Now, everything and everyone that even came close to you would quickly rot away, and the looks of pity soon became ones of disgust. There were only a few specific exceptions, such as your clothes, meaning that even to eat, you had to use gloves. Not only that, but the blessing only stopped the sickness from progressing, so the previous damage to your lungs remained, making you dependent on medicine from time to time.
Eventually, your parents had six other children—five girls and one boy—who would now take your place as heir.