What is the true purpose of the One Piece?

It is highly likely that Oda drew inspiration from Churchward's theories of a lost pacific motherland ("Mu") to construct the void century, the mystery of the "D" and the true nature of Nika.

Ever since one piece came out The question everyone asks is " What is the Treasure at the end of the story on Laugh Tale" People haven't gotten much besides trying to formulate an answer that the readers themselves would desire. "The Truth of the void century", "The end of the Red-line and Grand-line into the all Blue", "End of the world government" have been the most popular theories from the fans themselves but Oda wouldn't have this thing still be a mystery 29 years later if it was that easy. But with the final saga and the reveal in egghead of "Devils fruits are made from peoples dreams" also added a new thing to answer that most people ignored. "If Devil Fruits are dreams then why don't we see anymore of them" My theory is that Devil Fruits and the powers of dreams themselves don't just need peoples dreams to manifest into reality. They need a power source. The Treasure that Joy-boy Locked away at Laugh Tale, Roger laughed at, and what Vegapunk thought the future would be shaped by whoever claimed it is "The Sun" That returns at the end of the third world with the Dawn. It will be what Luffy uses to accomplish his dream. It will be the signify that the cycle of Tyranny and chaos of the last 3 worlds came to an end. It not only has the power to allow New Devil fruits to Spawn after it's unleashed but also allow the technology that the ancient Kingdom used to be powered once again and recreate the world Vegapunk hoped for humanity. The final fight of this story will Luffy making sure that BB doesn't use the sun to take over the world but also allow him to achieve his dream. To have a party with the entire world.

This theory proposes that Blackbeard will absorb the One Piece, a sun capable of turning imagination into reality, and kill Luffy, stealing his Nika Devil Fruit. Law will then sacrifice himself to revive Luffy, who will regain his Nika powers through the prayers of humanity and destroy the One Piece with his final attack.

What is the One Piece? This question is probably the only question universally asked by each and every person who watches or reads One Piece. The time will come when we learn the truth, literally.

Luffy finds the One Piece, but Blackbeard steals its power. To save the world, Luffy must destroy the treasure he spent his life searching for. Because unlike Blackbeard, Luffy's dream was never about possessing it.

Luffy does but is revived by the One Piece.

The theory is about what the One Piece could be, what it could mean, and where it could be, partly-inspired by the real life One Piece