"Avada kedavra."
A green light shot across the clearing and hit Harry in the chest. He was thrown back at least 20 feet before slamming into the trunk of a tree and crumpling to the ground.
Voldemort lowered his wand, examining his fallen foe with caution. Then he smiled, eyes wide and mad.
"Harry!" shouted Hagrid, but the Death Eaters held him back from running to his friend's side.
Voldemort began to laugh. At first it was a quiet chuckle, but it soon erupted into loud, maniacal laughter that could be heard across the entire forest.
"Harry Potter!" he laughed, sneering at the corpse lying at the other end of the clearing. "The boy who died!"
The other Death Eaters began to step towards the body, and when they saw that it was well and truly dead, they, too, began to laugh. But their festivities were soon interrupted by a single word:
"No."
All stopped laughing and looked at Harry, still lying at the foot of the tree. Although his skin was pale and cold and his eyes were beginning to sink into his skull, his voice continued to echo across the clearing.
"You cannot kill me," he continued, "for I am more than a man."
Back at Hogwarts, as dawn broke over the green Scottish mountains, all the students raised their wands in unison, shooting liquid fire into the air.
"I am a school," Harry said. The fire shot over the treetops, and Voldemort's gaze followed it as he seized up in terror.
"Someone stop him!" the dark lord cried, but his Death Eaters were distracted. Similar golden fire was bursting out of their own wands. Hagrid broke free of the grips of his tormentors and threw both of them to the ground in a single motion.
"I am a people," Harry continued.
Across the world, in the home of every witch and wizard, wands began to release liquid fire into the air, bursting through windows, roofs, and tree canopies in doing so.
"I am a planet."
Great cracks began to appear across the Earth's surface, and from these cracks arose huge waves of magma. Tidal waves and earthquakes shook the world, but the people were not afraid. As they saw their own doom approaching, all stood proud and greeted Death as an old friend.
All except one. Lord Voldemort, once called Tom Riddle, saw the reaper approaching and tried to flee. But before he had even taken one step, he felt a great pain in his chest. He fell to the ground, clutching it, and could only watch in horror as his sternum split open to allow his own heart to wriggle out onto the ground and turn to mud. He died screaming.
Harry was soon alone in the clearing, lying among the roots of the tree. Color had returned to his face, and light to his eyes. He stood up and examined what had happened.
"My work still isn't finished," he sighed, and picked up his wand. He pressed the tip to his scar. There was a flash of light, and Harry Potter vanished completely.
The cracks that had appeared across the world had begun to spread. The entire planet shook, and then like an egg it broke open, leaving only fragments.
Out of the remains of the egg flew a massive bird of fire and light, like a phoenix. On one wing it bore the souls of those who had lost their lives, on the other it bore the souls of those yet unborn, and on its head - its crown - sat the souls of those who lived today.
The phoenix flew, faster than anything in the universe, beyond the cloud of asteroids that surrounded the solar system and beyond the sea of stars that was the galaxy. And when it had reached center of the galaxy, it stopped.
On that day, the phoenix sang for all the universe.
A/N: Yeah, I completely based (cough, cough, plagiarized) this from Alejandro Jodorowsky's unproduced Dune film. (Don't worry, it's not an exact match.) I thought it would be funny to give Harry Potter a similar ending.