Voldemort's magic lashed out in fury at Harry. A pounding rain of large fireballs pelted the area around his dodging form. They exploded on impact, sending burst of dust in all directions. In a final resort attempt to block them, Harry formed a loose magical shield around himself, deflecting the incoming spheres away.
The Dark Lord, seeing Harry's success, began chanting ominously at the sand around him. A large mound began to lift from the earth, soon towering up and slimming into a vaguely human shape. "Anima!" commanded Voldemort, and the sand monster spun around and charged right toward Harry.
Realizing that his shield would have no effect on this creature, Harry cancelled it and tried desperately to think of a good counter-spell to the sand beast, which was closing in on his defenseless body. At last he aimed his wand and shouted "Solidus," turning the thing into a mass of stone.
Without missing a beat, Voldemort magically seized the frozen beast, and with the roar "Lapiswasi" pitched the statue across the sky straight at Harry. Harry, who knew that there was no time to dodge this bullet, carefully pointed his wand and yelled out the Reductor curse to blast the stone from the air. He succeeded, as was rewarding as falling shrapnel cascaded into the dirt a few meters in front of him.
But his opponent was not nearly out of tricks yet. "Vespertilio!" said Voldemort, and a thick cloud of black smoke poured from his wand. It flew quickly through the air, morphing into a group of thick clumps, solidifying, and revealing itself as a huge crowd of giant vampire bats, flitting directly at Harry, who almost cried out in shock. He began yelling the Reductor curse over and over, trying to blast the bats out of the air. He only managed to hit a few, but there were still hundreds more. They were filling up his view, blocking out Voldemort completely. For a moment, Harry feared that his foe had fled the scene, but then he reminded himself that Voldemort was far too confident to run away from this fight.
The bats continued to advance. Harry tried using the Impediment curse, but even than was ineffective. At last, just as they were upon him, the idea struck. "Incendio!" he cried, sending a wave of red flames shooting from his wand, spraying the bats and driving them away. They shrieked in pain as he torched them mercilessly, then finally retreated as his inferno overcame their attack. Voldemort, returned to sight, waved his hand, and they disappeared.
Harry knew this was his chance to make a decisive strike. He found a large boulder nearby and Banished it, right at Voldemort. The rock was smashed to pieces by a massive fireball before it had even gotten half way to Voldemort, who then cursed Harry by screaming "Petrificus Totalus!" Harry felt his muscles freeze in place as he was put under the full body bind.
Voldemort began to smile his evil, hollow grin again, his foul lips twisting to produce an even more horrifying face then usual. "So. The mighty Harry Potter is defeated," he taunted as he quickly walked towards Harry. His voice rang with a victorious song. "You fool. How did you hope that you, only a student, could conquer me, Lord of Magic?" He raised his long arm, pointed his wand, and slowly, ever so slowly, pronounced the word "Crucio."
The wash of anguish coursed through Harry's veins like a furnace. His very insides were being eaten away by the poison of a thousand stinging scorpions, striking again and again, all over his skin, which felt as if it was being peeled off agonizingly, exposing his raw flesh to the world. He would have been on the ground in spasms had he not been bound still.
Voldemort raised his wand, lifting away both of the curses. Harry collapsed, but was ready with a return. "Expelliarmus!" Harry yelled out the word, and lifting his hand, waiting to catch the wand that was now rushing to him like a missile. But before it had even gotten ten meters from the hand of its owner when it stopped in mid air, rotated, and shot back to Voldemort, who caught it and moved into attack position.
"The wand return spell. Never leave home without it," the black figure cackled, then, with a powerful Banishing spell, threw Harry back several meters to the ground. "Expelliarmus!" he shrieked, and Harry's wand shot right into his open palm. "Die! Avada Kedavra!!!!"
Harry spun on the ground, just missing the red bolt of magic energy. "Time for a surprise, Riddle," he mumbled as he pulled out his secret weapon. For this final duel, Ron Weasely had allowed Harry to borrow his own wand, just in case something like this situation came up. While still rolling in the sand, Harry pointed his wand right at Voldemort and quietly said, "Accio Boot!"
Voldemort's large leather boot ripped right off his leg, knocking the evil man to the ground with a thud. As soon as his opponent was down, Harry Summoned the real goal: his wand. Both objects came right to Harry, who discarded the boot, and prepared for a new attack.
Voldemort was furious with anger. "Avada Kedavra!" he screamed, but Harry ducked under that one, too. Voldemort hissed in frustration. Potter was refusing to die!
Harry seized the moment and yelled at the top of his lungs "Fulmen!" A bolt of brilliant white lightning exploded out of his wand, hitting Voldemort right in the chest. The crackling bolt forked out from Harry's wand, turning blue as the huge electrical charge pulsed into Voldemort's body, which was convulsing and writhing in the sand. As Harry watched the awful scene, he thought to himself, "This spell cannot be any less painful than the Cruciatus. Is it any worse morally?" As he thought about the ethics of his actions, Voldemort managed to block the spell and deflect the deadly beams of power. He then Banished the unexpecting Harry back through the air, ending the lightning spell.
Harry hit the ground hard. He felt his left arm snap beneath his weight. A wave of pain climbed up his arm and began pounding in his head. He looked up to see Voldemort still on the ground, recovering from the magical blast of electricity. He had to take this time, now!
In a loud, clear voice, Harry called out, "Ventus Maximus!"
The earth seemed to begin shaking. The few wisps of cloud above the duelers appeared to hang for a few moments, as if suspended by a thread that was unraveling. Then the spell hit. A massive wind tore onto the scene with the force of a thousand locomotives. The sand flew up in all directions, ripping out the small plants and rolling even the biggest boulders away. The clouds shot like cannonballs into the distance. Harry, as the caster of the spell, was unaffected, but Voldemort was thrown like a rag doll. The sound was unbearable; Harry put his hands over his ears, trying to block out the scream of the wind. "Finis!" he screamed out, but he didn't hear anything. The counter-spell worked, however, and the wind instantly ceased, dropping with a crash everything that had been blown into the air. A pouring rain of plant shreds, small rocks, and tons of sand slammed to the ground, flattening Harry.
He tried to move, but with no success. He was trapped.