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.
It could be that Harry acquires the ability to absorb information through a magical artifact or a unique spell. Maybe it leads him to uncover hidden secrets in both the Harry Potter and Stargate universes.
Well, if Harry Potter absorbs the Goblet of Fire in fanfiction, he might gain some extraordinary powers. Maybe he could control fire in a way that no one else can. He could use it to protect himself and his friends from the Dark Arts. It could also make him a target for more powerful dark wizards who want to use his new power for their own evil purposes.
Well, it might enhance his abilities in some ways. Since a Horcrux contains a part of a powerful dark wizard's soul, absorbing it could potentially give Harry access to some dark magic knowledge or powers, though it would also likely be a dangerous and unstable influence on his magic.
When Harry absorbs the Goblet of Fire in fanfiction, it could open up new areas of magic for him. He might be able to access spells that are related to fire and heat that were previously unknown to him. His magic could become more attuned to the element of fire, allowing him to sense things related to fire in the wizarding world. This could include detecting hidden fire - based traps or finding objects that have a connection to fire magic.
A great 'Harry Potter absorbs souls' fanfiction is 'Soul Absorption: A Dark Twist'. In this one, Harry is tricked into absorbing souls as part of a plot by a secret society. The story is really interesting as it delves deep into the lore of the Harry Potter universe and how such a dark magic would impact the wizarding world. It shows how Harry struggles to keep his sanity while also trying to find a way to free the souls he has absorbed. It also has some great character development for Harry as he goes from an innocent boy to someone burdened with this dark power.
I'm not sure of a specific one off the top of my head. But you could try searching on popular fanfic websites like Fanfiction.net or Archive of Our Own. Look for tags like 'Harry Potter', 'wand absorption', and sort through the results to find one that looks interesting.
In fanfictions, it often works through dark magic spells. For example, Harry might stumble upon an ancient spell book and accidentally cast a spell that starts the soul absorption process. Or it could be a result of a cursed object that he comes in contact with.
First, focus on unique abilities. For example, create a test for the ability to understand Parseltongue without being a Slytherin. Second, add some high - stakes situations. Maybe the characters are being tested to save Hogwarts from a new threat. Third, give each character their own special ability that they have to master.