Using black magic could have a negative impact on her own soul or magical essence. It might start to corrupt her, changing her personality. She could become more cruel, self - centered, and lose her moral compass. This would not only affect her relationships but also her own well - being as she gradually loses herself to the dark power of black magic.
She might start using black magic out of a sense of desperation. Maybe she feels she has no other way to achieve her goals, like protecting her loved ones or getting revenge on her enemies.
He could lose his friends. In the original story, his friends stand for good and oppose black magic. If Harry starts learning it, they might turn their backs on him. Also, he could be ostracized by the wizarding community. The wizarding world has a clear stance against black magic, and Harry would become an outcast.
One possible consequence could be his expulsion from Hogwarts. Using black magic is strictly prohibited in the wizarding world, and the school has a zero - tolerance policy. Another consequence might be the loss of his friends. His friends, who uphold the values of good magic, might not be able to accept his use of black magic.
One potential consequence could be early detection by the Ministry of Magic. In the original series, under - age magic is closely monitored. So in fanfiction, this might lead to Harry getting into trouble with the authorities much sooner. He could face warnings or even expulsion threats from Hogwarts if the school finds out.
One possible consequence could be a moral breakdown within Harry himself. He's always been against dark magic, so using Crucio might make him question his own values. Another consequence could be alienation from his friends and allies. They would likely be shocked and appalled that he resorted to such a cruel curse.
In fanfiction, the consequences can be complex. The snake - based healing might create a bond between the healed person and the snake that has unforeseen implications. For example, they might start to have some snake - like characteristics or instincts. Additionally, the method of using the snake to heal could attract unwanted attention from dark wizards who want to use this power for evil purposes. Harry might then have to protect the knowledge of this healing method and those who have been healed, which could put him in many dangerous situations.
One possible consequence could be his estrangement from his friends. In the original Harry Potter world, his friends are firmly on the side of good. If he starts using dark rituals, they might not be able to understand or accept his actions. Another consequence could be a corruption of his own soul, as dark magic is often depicted as having a corrupting influence in the series.
I'm not entirely sure specifically what this particular fanfiction is about without reading it. But generally, a 'fem Harry Potter' would be a female version of Harry Potter in a fan - created story. If it's described as 'a black fanfiction', it might involve themes related to black culture, black characters, or a new take on the Harry Potter world from a perspective that incorporates black experiences. However, this is just speculation.
One consequence could be that it makes him a more formidable opponent. His enemies would have to rethink their strategies as he can now teleport.
One possible consequence could be chaos. Muggles would be both terrified and fascinated. Governments might try to control or study the magic, leading to a power struggle. The wizarding world's secrecy, which has been maintained for centuries, would be shattered, and wizards would have to face the fact that their world is now exposed to those who don't understand magic.