Well, it could be about Harry discovering he has an extraordinary ability to control all elements. Maybe he uses this power to fight new dark forces in Hogwarts.
The plot could involve Harry finding an old, enchanted bow in the Forbidden Forest. He discovers he has a natural talent for archery and starts training in secret. As he gets better, he uses his archery skills to help during the Triwizard Tournament, hitting targets that others can't reach with magic, and thus winning challenges in a unique way.
One possible plot could be that Harry Potter somehow gets transported to the Halo universe. He has to learn to use Master Chief's weapons and fight alongside him against the Covenant. Meanwhile, he also tries to figure out how to use his magic in this new high - tech world.
Well, it could be about Harry using his skills and influence in the wizarding world to reform the political system. Maybe he starts by uniting different magical communities within Hogwarts, like the houses, and then expands it to the whole wizarding society.
The plot might center around Harry being the master of darkness as a way to subvert the prophecy. Instead of being the 'Chosen One' in the typical light - against - dark way, he uses the knowledge of the dark arts to understand and outwit Voldemort. He could be learning long - forgotten spells from the darkest corners of Hogwarts library and using them to his advantage.
It could be about Harry Potter achieving a new level of power and using it to bring great changes in the wizarding world. Maybe he masters a form of magic that gives him control over life itself, like being able to heal any injury or even bring the dead back to life in a limited way.
Well, perhaps Harry discovers an ancient magic that allows him to wield a lightsaber. He could use it to fight Voldemort in a more unique way, combining the magic of the wizarding world with the power of the lightsaber. Maybe he has to go on a quest to learn how to master it fully.
Well, one plot element is the discovery of the sword - related power or ability. Maybe it's a magical sword he finds or a latent ability within him that he unlocks. Then there's the part where he has to keep it a secret at first, because it's so different from normal wizarding abilities. And of course, there are often battles where his swordsmanship gives him an edge over his opponents, making him a key player in the fight against the dark forces in the wizarding world.
One possible plot for this fanfiction could be that the DC universe is facing an otherworldly threat that has something to do with death and the afterlife. Harry Potter, as the master of death, is drawn into this situation. He has to navigate the complex politics and powers in the DC world while also dealing with his own powers related to death. He might meet characters like Batman, who is initially skeptical of his magic but then comes to respect his abilities as they work together to save both worlds.
Perhaps in this fanfiction, Harry Potter as the master of fire and darkness is called upon to save a different magical realm that is on the verge of destruction due to a dark force. His fire powers could be used for both destruction of the evil and for providing warmth and light in the desolate realm. His dark powers might help him understand the nature of the enemy better, like being able to sense their motives and weaknesses. He may also meet new magical creatures along the way that are drawn to his unique powers.
One possible plot could be that Harry Potter discovers a hidden magic that links him to the Nordic gods. Maybe he has to use his newfound connection to stop an ancient evil that threatens both the wizarding world and the realm of the Nordic gods.