One possibility is that they encounter other lost souls in Tartarus. These could be the souls of ancient heroes or villains. Interacting with these souls could either help them or put them in more danger. For example, some souls might offer them advice on how to navigate the treacherous terrain of Tartarus, while others might try to deceive them into making wrong decisions. And they would surely be tested both physically and mentally. The harsh environment of Tartarus would push their limits, and they would have to overcome their inner fears and doubts to have any chance of escaping.
In some fanfictions, Annabeth and Percy might struggle with PTSD. They could have nightmares about their time in Tartarus. Percy might be overly protective of Annabeth, and they may need time to heal their emotional wounds together.
In this fanfic, they might face terrifying monsters. Tartarus is full of dangerous creatures, so they could be constantly fighting for their lives, like battling against ancient Titans or monstrous beasts that are native to that hellish place.
Well, it could be that the gods are watching Nico in Tartarus as a form of judgment. Maybe they want to see if he has truly changed or grown. They might be using his time in Tartarus as a test of his character. Nico, being in Tartarus, is likely facing numerous terrifying creatures and dangerous situations, and the gods' watching could add an extra layer of tension, like they are waiting to see if he will succumb to the darkness or rise above it.
In this fanfiction, they may discover some long - lost secrets about Tartarus. Maybe there are ancient powers hidden there that could either help them escape or doom them if they don't use them correctly. Percy and Piper would have to struggle not only against the physical threats but also the psychological ones. The darkness and despair of Tartarus could test their mental strength as much as their physical abilities. They might meet other lost souls or mythical beings that could be either allies or foes in their journey to get out.
He might face numerous terrifying monsters. Tartarus is full of dangerous creatures, and without his friends, Percy would have to rely solely on his own skills and the power of his demigod abilities to fight them off.
Surviving in Tartarus would require them to adapt quickly. The place is full of unpredictable and extreme conditions. They need to find shelter from the various hazards, like the volcanic eruptions and the attacks of powerful monsters. Their friendship and mutual trust would also be a great strength. They can support each other emotionally, which is crucial in such a terrifying and desolate place. For example, when one of them is feeling down or hopeless, the other can cheer them up and keep their spirits high, so they can keep on fighting for survival.
Well, they could be betrayed by someone they trusted deeply, like a fellow demigod. Maybe this person spreads false rumors about them, leading to their isolation within the demigod community. The three of them would then have to struggle to clear their names and find out who really set them up.
A Percy and Nico fight in fanfiction might be a complex affair. Their respective loyalties could come into play. Percy is loyal to Camp Half - Blood and Nico has his own complex allegiances. They could be fighting because of different ideas about how to deal with a new threat to the demigod world. Percy might think of a more upfront approach using his powers, while Nico could be more inclined towards using his knowledge of the Underworld and the dead to outwit the threat. This difference in approach could lead to a fight between them as they try to impose their methods on each other.
In fanfiction, when Percy meets Kronos in Tartarus, it could be a battle of wits. Percy has faced many challenges before and learned from them. Kronos, on the other hand, is cunning. Percy might try to outsmart Kronos by using the chaotic nature of Tartarus against him. He could lead Kronos into a trap where the very essence of Tartarus, like the rivers of fire or the howling winds, would weaken the Titan.
In the fanfiction, Percy could be there to check on Nico. Since Nico has had a tough time, Percy might want to make sure he's doing okay at school. He could offer to help Nico with any problems he's having, like dealing with bullies or difficult classes.