The Horcrux Fragment of Hero Island was an item that could be purchased in the Horcrux Shop to exchange for a Horcrux. The method of obtaining a Horcrux fragment may vary depending on the game version, but it can usually be obtained by completing specific missions, challenging or defeating specific enemies.
Horcrux fragments can be exchanged for different types of Horcruxes, including ordinary Horcruxes, advanced Horcruxes, and bound Horcruxes. Normal Horcruxes were not bound, while high-level Horcruxes and bound Horcruxes were bound and could only be traded with specific NPCs or purchased with game currency.
The process of exchanging Horcrux fragments for Horcruxes may face challenges and risks such as being defeated by enemies, encountering random events, and so on. Therefore, when exchanging for Horcruxes, it was recommended that players possess sufficient strength and skills to ensure that they could exchange for the Horcruxes they desired.
If Harry were to create a Horcrux in fanfiction, it would likely lead to a great corruption of his soul. Horcruxes are dark magic, and the act goes against all that Harry stands for in the original series. He might start to show signs of increased aggression, a detachment from his friends, and a growing attraction to the Dark Arts.
Well, it could be that Dumbledore, in some fanfic versions, figures it out first and then reveals it to Harry. Dumbledore is often portrayed as having a deep understanding of magic. He might have noticed some strange magical patterns or behaviors related to Harry that led him to suspect and then confirm that Harry was a Horcrux. And then he would tell Harry about it, which is how Harry comes to know.
Perhaps his father's old wand. It has a connection to his family and his heritage. Since it's a wand, it already has a certain amount of magical energy, so it could potentially be a suitable vessel for a Horcrux. And it would be a very interesting twist on the concept of a Horcrux as wands are not a typical choice.
One consequence could be that his connection to Voldemort becomes even stronger. This might lead to him being able to sense Voldemort's actions and thoughts more clearly, but also make him more vulnerable to Voldemort's attacks on his mind. Since the Horcrux is a part of Voldemort's soul, it could also start to influence Harry's personality, making him more aggressive or moody at times.
The female protagonists of novels such as "The Demon King's Pet Burst, The Reborn Poison Concubine Is Very Arrogant,""The Killing God Empress,""Yan Lian," and "The Lord of the Soul Eater" had soul devices. I hope you like this fairy's recommendation. Muah ~😗