In the 'Percy Jackson uses a spear' fanfiction, how does Percy obtain the spear?

It could have the ability to control water, like Percy's sword Riptide. Since Percy has a strong connection to water, the spear might be enchanted to work in harmony with his powers. For example, he could make the spear shoot out jets of water at his enemies.

In some fanfictions, he might find it in an ancient weapon stash hidden in a mythical location. Maybe while on a quest, he stumbles upon a secret chamber where the katana is kept as a powerful relic from an old civilization.

In some fanfictions, Percy might obtain the trident through a special quest. Maybe he has to prove himself worthy to an ancient sea deity who then bestows the trident upon him as a symbol of power and trust.

Well, he might find it in some mysterious place like an ancient temple. Maybe it was left there by a powerful being from another dimension.

He might find it during an underwater adventure. Maybe he stumbles upon an ancient temple dedicated to Poseidon and there, in the center, lies the trident. It could be a test set by Poseidon himself for Percy to prove his worthiness to wield such a powerful weapon.

Perhaps he discovers it in an ancient, hidden temple dedicated to a forgotten god. The sword could be a gift from this god, who sees potential in Percy to use it for good.

In the fanfiction, it's possible that the boa staff is a reward for Percy helping out a magical creature. He could have saved a snake - like being that has a special bond with the boa staff. As a token of gratitude, the creature gives Percy the staff which then becomes an important part of his adventures.

One way Percy Jackson could obtain Mjolnir in fanfiction is through a quest. Maybe the Norse and Greek gods come to an agreement for some reason. The gods set up a series of challenges that Percy must complete. These challenges could test his courage, strength, and wisdom. If he passes all of them, he is deemed worthy and is given Mjolnir as a sort of temporary loan or gift for a specific purpose, like saving both the Norse and Greek realms from a common threat.

Well, in some fanfictions, it might be related to his demigod powers. Since he has a connection to the water element, blood being a liquid could potentially be manipulated in a way similar to how he controls water. Maybe he can sense the water content in blood and use his will to move or influence it.

Well, in some fanfictions, Percy might control ice through a new power bestowed upon him by some mysterious god or entity. Maybe he discovers he has the ability during a quest when he's in a really cold and magical place.