Perhaps in this fanfiction, Harry has become disillusioned with the wizarding world after some great tragedy. He blames Hagrid, who he sees as a symbol of the old, failed system. He then devises a plan to poison Hagrid as a way of getting revenge on the world that has let him down. Or it could be that a dark entity has possessed Harry, and it uses his body to carry out the act of poisoning Hagrid, while Harry is powerless to stop it.
One possible plot could be that Harry has been influenced by a powerful dark object. This object slowly corrupts his mind, making him believe that Hagrid is a threat to his new - found dark power. So, he decides to poison Hagrid. Another plot could be that Harry has been misled by a dark wizard who convinces him that Hagrid has betrayed him in some way, and in his anger, he resorts to poisoning.
I'm not sure if there is a specific 'dark harry poisoned hagrid fanfiction' out there. Fanfiction is a vast and diverse world, and while there might be some dark or alternative takes on the Harry Potter universe, this particular scenario might be quite rare or not widely known. It could potentially involve a dark version of Harry being influenced by dark magic and using it against Hagrid, which would be a very different and disturbing take on the relationship between the two characters.
One possible plot twist could be that Dumbledore was under the influence of a dark magic spell that made him kill Hagrid. And Harry, realizing this, has to find a way to break the spell and clear Dumbledore's name while also dealing with his own grief and anger over Hagrid's death.
Voldemort or his Death Eaters are obvious possible culprits. They've always wanted Harry dead, and poisoning could be a more insidious way to get rid of him compared to a direct attack. Another possibility could be a jealous student at Hogwarts. Maybe someone is envious of Harry's fame and power, so they poison him out of spite. It could also be a wizard from a rival wizarding school who sees Harry as a threat to their own school's reputation.
Well, one possibility is that Harry is tricked into joining the dark side. Maybe Voldemort uses some dark magic to cloud Harry's mind and make him believe that the dark ways are the right ones. He could start using dark spells and turn against his friends.
It could be that the Dark Lord offers Harry something irresistible. Like a way to bring back his parents. Harry, being desperate to have his family back, might be tempted to join the Dark Lord in the fanfiction. After all, the love for his parents was always a strong driving force in his character, and this could be a major turning point that leads him to side with the Dark side.
Well, one possibility could be that Harry is driven by a deep sense of betrayal. Maybe he discovers some dark secrets about the wizarding world that make him question everything he has believed in. For example, if he finds out that Dumbledore has been using him all along for some self - serving purpose. This could push him towards the dark side as he feels that the so - called good side is just as corrupt.
Well, one possible plot could be that Harry's friends race against time to find an antidote. Maybe Hermione uses her vast knowledge of magic to research ancient spells and potions that could counteract the poison. Another could be that the poison has some strange side - effects on Harry, like giving him temporary new magical abilities while also slowly killing him, and he has to figure out how to use these new powers to save himself. Or perhaps the poisoning is part of a bigger conspiracy within the wizarding world, and Harry's poisoning is just the first step in a plot to take over Hogwarts or the Ministry of Magic.
In 'Harry Joins the Dark Fan Fiction', perhaps Harry is deceived by a powerful dark wizard who convinces him that the dark path is the only way to truly protect the wizarding world. This could lead to him abandoning his previous values. He could be trained in dark arts, and as a result, he might become an outcast among those he once called friends. However, there could also be a plot twist where he realizes his mistake and tries to redeem himself.
One possible plot could be that 'Cage' is a magical artifact that Hagrid discovers in the Forbidden Forest. He shows it to Hermione, and they realize it has some sort of powerful magic. Maybe it's a cage that can hold dark creatures but is starting to malfunction, and Hermione and Hagrid have to figure out how to fix it before the creatures it's holding escape and cause chaos in Hogwarts.
Maybe the sunglasses are magical. They could grant the wearer special powers like the ability to see in the dark better than normal, or even see hidden things. The story could be about a person who discovers these powers and has to use them to solve a mystery.