Perhaps there's a plotline where Percy discovers new and dark powers within Tartarus that he has to learn to control. This could lead to him having to make difficult choices about whether to use these powers for good or risk being consumed by them. He may also encounter other fallen or corrupted beings that either try to help or hinder him on his journey.
Another interesting plotline could be Percy's attempts to find a way out of Tartarus while being constantly pursued by the terrors that lurk there. He could form unlikely alliances with other tortured souls. Along the way, he might uncover secrets about Tartarus itself that no one has known before, which could be crucial to his escape and the possible future of the world above.
Well, a plotline could be Percy having to adapt to the extreme and harsh environment of Tartarus. The place is full of darkness and danger. He might have to learn to harness the strange and dark energy that exists there in order to defend himself. There could also be a plot where Percy is forced to make difficult choices. For instance, he might be presented with an option that could save him but at a great cost to others. This would test his moral compass and show how much he has grown as a character in this extreme situation.
Well, a great plotline might be Percy's struggle with his own inner demons while in Tartarus. He could be haunted by his past failures and the fear of not being able to save his friends. This internal battle could be paralleled with his physical battles against the terrors of Tartarus. Also, there could be a plotline where Percy discovers a long - lost power within himself that is the key to either ruling Tartarus or escaping it.
One possible storyline could be Percy struggling with PTSD after Tartarus. He might have nightmares and be overly cautious in battles. For example, he could hesitate when facing certain monsters that remind him of the terrors in Tartarus. Another could be Percy's changing relationships. Maybe his friends don't fully understand what he went through and he has to deal with feelings of isolation. He could also discover new powers or a deeper connection to his godly heritage as a result of his Tartarus experience.
One interesting plotline could be their struggle against the various monsters in Tartarus. For example, facing off against the giants or other terrifying creatures that lurk there. Another could be their search for a way out while dealing with the psychological toll of being in such a dark and desolate place.
One possible plotline could be Percy's struggle for survival in Tartarus. He might have to face off against various terrifying monsters. Another could be his journey to find a way out while dealing with the psychological trauma of being in such a hellish place. And perhaps he discovers some long - hidden secrets about Tartarus itself during his time there.
One interesting plotline could be Percy's struggle against the various monsters in Tartarus. He might have to use his wits and powers in new ways to survive. Another could be his journey to find a way out, perhaps making unexpected alliances with other beings trapped there.
One possible plotline could be a darker version of their quests. For example, instead of simply fighting monsters to save the world, they might be forced to make morally ambiguous choices. Maybe they have to sacrifice some innocent bystanders to defeat a greater evil. Another could be a power struggle between them where their darker sides come out. Percy could be more power - hungry and Annabeth more calculating in a way that challenges their friendship.
A third plotline could be about Percy's mental and emotional state during his banishment. He could be dealing with feelings of betrayal, as he was banished. He might question his identity and purpose, and throughout the fanfiction, he gradually overcomes these doubts and insecurities, emerging stronger in character even if he's still trapped in Tartarus.
A third plotline could be Percy's search for a powerful artifact or knowledge in Tartarus that could help him in his future battles or save his friends. Along the way, he discovers secrets about the origin of the gods or the true nature of Tartarus itself, which changes his understanding of the world he thought he knew.
In some fanfictions, Percy's torture in Tartarus could be part of a grander scheme. For example, an enemy on the surface world has made a deal with the forces of Tartarus to weaken Percy. As he endures the torture, he gradually uncovers the conspiracy and tries to find a way to not only escape but also stop those who sent him there. His friends, unaware of his situation at first, start to suspect something is wrong and embark on a quest to find out what happened to him and rescue him.