Itachi, Luna Lovegood's husband, found himself at the head of the Grand Dining Hall. His place of honor was not one he took lightly. His life had been marked by significant moments, but none compared to this.

He conversed softly with Luna, his wife. Her radiance was amplified by the mystique surrounding her husband's power. Their love for each other was evident in every look, every touch.

Suddenly, the room fell silent as Voldemort entered the Hall. The air grew cold and the lights dimmed as his dark figure moved menacingly through the crowd.

"Avada Kedavra!" Voldemort shouted, his voice echoing through the hall. The green killing curse shot towards Itachi, but something strange happened. The spell stopped, inches from Itachi's chest.

Everyone watched in shock as the spell dissipated, leaving Itachi unharmed. The room was silent, save for the collective gasps of the Hogwarts students.

Harry Potter, the chosen one, was the first to speak. His green eyes sparkled with curiosity as he posed a question to Itachi.

"When Voldemort sent Avada Kedavra towards you, why did it stop inches from you?" Harry queried, eyes never leaving Itachi's calm face.

"It's because of my Limitless," Itachi responded calmly, his gaze steady and unyielding. The answer was met with stunned silence as the students processed his words.

"Limitless?" echoed Professor Dumbledore, his wise eyes reflecting a glimmer of intrigue. The old wizard looked at Itachi expectantly, eager for an explanation.

"It's an ability only I have," Itachi began to explain, his voice steady and clear. Aside from the crackle of the fireplace, the room was silent, everyone's attention was on him.

"So, what does it do?" Ron Weasley's voice cut through the silence. The young redhead's curiosity shone through his wide, freckled face.

Itachi began to elucidate his ability, describing the four types- Neutral Infinity, Lapse Blue, Reversal Red, and Hollow Purple. His voice echoed in the grand hall.

"Infinity creates a convergence of infinite series. Anything that approaches me will never reach," he stated, his voice steady and serious, leaving the crowd in deep contemplation.

"Blue turns the concept of negative distance into reality. This causes surroundings to try to fill the space by pulling violently into the source," Itachi explained further, his words echoing off the stone walls.

"Red is turning the divergences of infinity into reality, generating the power to repel and generate an explosive force," Itachi continued. His words hung heavy in the air, causing shivers down everyone's spines.

"And finally, Purple. By combining both, I create an imaginary mass that takes the target out of reality," he finished, his eyes deadly serious. The room was dead silent as they digested his words.

Hermione Granger, the brightest witch of her age, broke the silence. "Is there a downside to your ability?" She asked, her brown eyes keen with curiosity.

"No. Infinity is always active. It's a part of me," Itachi replied, his voice a whisper in the grand hall. His declaration left everyone in stunned silence.

Hermione nodded, her mind buzzing with questions. The room erupted in murmurs, the Hogwarts students and teachers alike sharing their thoughts and speculations.

Luna, understanding the gravity of the situation, held onto Itachi. She looked at her husband, her eyes filled with admiration for his strength and courage.

As the evening faded and the stars came out, Itachi and Luna retreated to their quarters. They knew their lives had forever changed, holding onto each other for support.

Luna whispered to Itachi as they lay in their shared bed. She thanked him for his bravery, her voice soft in the quiet room. Itachi simply held her tighter, sealing their bond.

The next day, Hogwarts buzzed with rumors about the previous night's encounter. Despite the talk, Itachi went about his day as usual, unbothered by the whispers.

Luna supported Itachi, their bond strengthening with each passing day. She admired her husband's strength and resilience, and stood by his side no matter what came their way.

Days turned into weeks, and weeks into months. Itachi stood unfazed by Voldemort's futile attempts to harm him. His Limitless power proved to be a formidable defense.

Harry, Ron, and Hermione, inspired by Itachi's strength, trained harder. They saw in him the power to defy the Dark Lord, igniting their determination.

Dumbledore, having witnessed Itachi's power, decided to include him in the Order of Phoenix. His Limitless ability brought new hope to their fight against the Dark Lord.

Itachi's Limitless not only saved him but also brought a new sense of hope to Hogwarts. His power was a beacon of light in their fight against the darkness.

Luna stood by Itachi's side, her love for him unwavering. Together they faced every challenge, their bond growing stronger. Itachi's Limitless was not only his power but also their hope.

Through it all, Itachi remained humble and grounded. Luna's love and the newfound camaraderie at Hogwarts only fueled his determination. The Limitless power, indeed, changed their lives forever.

Together, they fought against the forces of darkness. Itachi, with his Limitless, and Luna, with her unwavering faith, stood as a testament to love, power, and resilience in the face of adversity.

They were a beacon of hope for Hogwarts, their story serving as a testament of unbending will and indomitable spirit. And thus, the legacy of Itachi's Limitless continued to inspire.

A man named Itachi, Luna Lovegood's husband, came to Hogwarts and changed the course of their fate with his Limitless power. His story was a reminder for everyone there to never give up.

And so, the tale of Itachi’s Limitless ability was etched into the annals of Hogwarts, a lesson for future generations - a tale of love, resilience, and unwavering determination.

In the end, the power brought them closer than ever. It was the symbol of Itachi's Limitless love for Luna, and their unshaken faith in each other. Their tale was etched forever in the heart of Hogwarts.