The story could also deal with the aftermath in a more emotional way. For example, Annabeth, who was close to Percy, might go into a deep depression. Artemis, realizing the full impact of what she has done, might then embark on a journey to atone for her mistake. This could involve helping those Percy cared about, or trying to restore the balance that Percy's death has disrupted in the mortal and godly worlds.
It could be due to a lack of information. Artemis might not have known all the facts about Percy. For instance, if there was some sort of illusion or false information spread around, she could have misjudged the situation and accidentally killed him. Also, perhaps in the heat of a battle, she didn't have time to properly identify her target and made a tragic mistake.
Well, Percy is a resourceful character. In this fanfiction scenario, he could start by investigating the reasons behind being forced to marry Artemis. If it's some sort of plot by an enemy god, he'd work on uncovering it. He might also use his skills in combat and his connection to water to create some sort of diversion or escape plan if things get too tough. And he'd definitely have some internal conflict, given that Artemis is a virgin goddess and such a marriage goes against her nature too.
Percy could also react with a sense of determination. Instead of being defeated by the injury, he sees it as a challenge. He starts to figure out what made Artemis hurt him in the first place. If it was a misunderstanding, he tries to clear it up. If it was something more malicious, he starts to plot his revenge. He uses his own wits and the powers he has to either heal himself or find a way to make Artemis see the error of her ways. He might also seek the help of his friends, like Annabeth or Grover, to come up with a plan to deal with the situation.
One idea could be that Artemis feels extremely guilty and tries to find a way to reverse the blinding. Maybe she seeks the help of other gods or magical creatures. She could go on a quest to find a rare herb or artifact that has the power to restore Percy's sight.
One idea could be that Artemis feels extremely guilty and tries to find a way to reverse the crippling. She might search for rare magical herbs or consult with other powerful deities. Another could be Percy's friends rallying around him, with Annabeth leading the charge to find a solution, while Percy himself struggles with his new limitations and feelings of helplessness.
The story would take a very dark turn. Percy is a central figure, and his death would leave a huge void. His friends would be devastated. Annabeth, for instance, would likely be consumed with grief and seek revenge. This could lead to a new conflict within the demigod community.
Percy could also use his strategic mind. He has been through many battles and knows how to plan defenses. He might scout the area around Artemis and set up traps or early warning systems to protect her from any approaching danger. This would involve using his knowledge of the terrain and his skills in combat to ensure her safety.
She would probably be furious. Artemis has a strong sense of justice and protecting the vulnerable. So, she would likely immediately start to plan how to deal with those responsible for Percy's abuse.
She could also be angry. Given her power and status, she might feel slighted by Percy. She may take some form of revenge, not in a malicious way but perhaps by making Percy's life a bit more difficult during his quests. For example, she could send her hunters to interfere or withhold some information that could be useful to him.
There may not be mainstream popular 'Artemis kills Percy' fanfics because it goes against the typical heroic image of Percy. Most fans like to see Percy succeed and be the hero. But in some smaller, more experimental fanfic communities, there could be some interesting takes on this concept that have a following among those who enjoy exploring darker or more unconventional storylines.