Disclaimer: I don't own Harry Potter or One Piece which belong to their respective creators.
Stonehenge
A344, Amesbury, Wiltshire SP4 7DE, United Kingdom
Tuesday, June 23, 1998
Harry Potter stood in the center of Stonehenge in the middle of the pentagram he had drawn with his blood. At the five points of the pentagram were objects of power and great significance to him. The objects were all three Deathly Hallows(one being a Horcrux), Gryffindor's Sword, his own wand, Voldemort's wand, all of Voldemort's Horcruxes with himself in the center, and Voldemort himself bound and stunned. Harry closed his eyes and raised his hands above him as he began chanting in an unknown language. The chanting caused the ritual circle to start glowing as well as the objects including Harry's scar. The objects soon disintegrated into pure magic(with the piece of Voldemort's soul erupting from his scar painfully making him wince in pain but he kept on chanting) and coalesced above him and the monument into a huge mass of grey nearly black colored magic.
The huge coalesced mass of grey almost black colored magic above Stonehenge descended quickly down and into the body of Harry Potter as if sucked into it by a black hole. As all of the magic disappeared into Harry's body a bright flash of light suddenly exploded out from his body that encompassed the whole area within the monument of stones that blinded everyone close enough to see it. As the light faded away the only thing visible in the center of the stone monument was a pile of ashes where Harry once stood.
Deserted Island
East Blue
In a bright flash of light Harry appeared naked in the middle of what seemed to be a small deserted island in the middle of the ocean. He looked around him seeing a few trees and bushes. He wondered to himself where the ritual had gone wrong and where it had sent him and why the were trees so tall. The world around him started to spin as he crumpled onto the ground. The last thing he saw was a seagull flying in circles above him as he faded into unconsciousness.
Author's Note: This is a start to an idea for a crossover story between Harry Potter and One Piece. If anyone wants to take it over please review and tell me or PM directly me about it. I also have two forums called Harry Potter Challenges and iCarly Challenges set up for the challenges I make so if you could please stop by those and take a look to see if one of the challenges interests you.