The Last True Legacy
When the Hero started his journey he was 12, accused of stealing a weapon of mass destruction because of his heritage.
On the second quest, at age 13, the Hero journeyed through the Sea of Monsters to retrieve the Golden Fleece, to save his beloved camp.
On the Hero's third quest, at age 14, he was tasked with saving the Goddess of The Moon from the Burden of The Sky, once held by Atlas
On the fourth quest, at age 15, the Hero was sent into the Labyrinth created by Daedalus, with the help of a clear sighted mortal.
On the fifth quest, the Great Prophecy was nearing it's end, they fought against the Titan Lord, Kronos and defeated him albeit with heavy losses. At only age 16...no one should have to go through all of this...yet his journey did not yet end.
On his 6th quest, the Hero fought another war, this time against the Primordial Gaea. He was made to forget his past and sent to an unknown place very much like the one from his past but also very different. He fell into the depths of Tartarus with the one he loved. They narrowly escaped the depths of hell. They fought the final battle with their brothers and sisters in arms. Gaea in the end, loss, as do villains to heroes. All of this at age 17.
Years later...the Hero had a family with his beloved wife, a hero of legend to the newer generations. But peace and happiness cannot last forever.
Another war had begun, this time against the Primordial of Darkness and the Primordial of the Sky, Eberus and Ouranos. Demigods, Greek and Roman fell by the numbers, mortals died by the thousands. Gods faded from existence. The Mist soon fell, mortals turned to the gods for protection. The Hero lost everything, his loved one, his children. The Olympians, demigods and mortals lost their hope, Pandora's Box having become weightless, nothing but a useless empty box.
The Gods came up with a plan, to continue the legacy they have built, to send the Hero into an unknown dimension. The last words the Hero heard from his gods were, "Perseus Jackson, you are our last legacy, you must continue our mission, make us proud, Hero." Perseus, blessed by the gods, clad in full armor, his shield by his side, his trusty blade, Anaklusmos sheathed, and in his hand, a spear named Requiem, in remembrance of Olympus, kneeled before the gods one final time. Ancient words were muttered and in a flash, Perseus was gone. The gods sat in their thrones as Olympus along with the universe crumbled before their eyes. The last words to ever be heard in this universe were said by Poseidon, "Goodbye my son, may you live a long life." The gods closed their eyes for a final time. Than, an explosion of light happened and then there was nothing.