Well, in this fanfiction, it could be that the child is a key to something in Tartarus. Percy finds the child and then realizes that he has to keep the child alive because there are forces in Tartarus that want to use the child for their own evil purposes. He might team up with some old friends or make new allies within Tartarus to safeguard the child.
The plot might involve Percy having to protect the child from the various horrors of Tartarus. Maybe he has to fight off monsters while trying to find a way to get the child out safely.
One possible plot could be that Percy stumbles upon a lost or abandoned child while navigating the dangerous Tartarus. He then has to protect the child from the various threats in Tartarus, like monsters and the harsh environment. Maybe he forms an unexpected bond with the child as they struggle to survive and find a way out together.
The child could be a young demigod who got lost on a quest and ended up in Tartarus. Maybe they were trying to prove themselves and got in over their head.
The child could be a prophesied one. In the world of Percy Jackson, prophecies are common. So, this child could be the one foretold in some ancient prophecy that is linked to Tartarus. Percy finding the child sets off a chain of events that will either save or doom the world. Maybe the child is the key to closing a portal in Tartarus that is releasing evil into the mortal world, and Percy is the only one who can help the child fulfill this great task.
Well, in most fanfictions where Percy trains in Tartarus, it often involves him facing extreme challenges. He might be learning to control new powers or just surviving the harsh environment. For example, he could be training to fight stronger monsters that lurk in Tartarus.
Well, one possibility could be Percy facing his inner demons. In Tartarus alone, he might have to deal with the memories of his past failures and the fear that comes with being in such a desolate place. He could encounter strange and terrifying creatures that test his combat skills and his will to survive.
Well, in many fanfictions, Percy might be on a mission to assassinate some powerful being in Tartarus. Maybe he has to face all kinds of hellish creatures and overcome insane challenges. It could involve him using his water powers in unique ways, like creating weapons out of water to fight the demons of Tartarus.
One possible plot could be Percy and Zoe facing numerous dangerous monsters in Tartarus. They might have to rely on each other's unique abilities. For example, Percy's control over water could help them cross certain deadly rivers while Zoe's hunting skills could be used to fend off the approaching beasts.
One possibility could be Percy's struggle to survive the harsh conditions. He might have to find new ways to use his powers in Tartarus. For example, the strange and dark magic there could either enhance or limit his abilities. He could also form alliances with unexpected creatures. Maybe he teams up with some of the ancient and terrifying monsters that live there, but they have a common enemy, so they work together for a time.
Well, one possibility is that Percy has to deal with the various monstrous creatures in Tartarus. He might form alliances with some of the less evil ones to maintain order. Maybe he uses his powers over water in unique ways in the dark and chaotic environment of Tartarus.
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.