In Marvel as a summoning Mage

It's Phonixover

In the vast, white expanse of the Phoenix's dimension, the air crackled with anticipation as Ritsuka faced the fiery deity. The Phoenix, radiant and formidable, regarded him with a mix of arrogance and amusement.

"I challenge you, Phoenix," Ritsuka declared, his voice steady and resolute, his eyes locking onto hers with a cold intensity.

The Phoenix's eyes widened slightly. She could sense something different about this mortal, something she hadn't anticipated. His gaze, cold and unyielding, carried the weight of countless battles and sacrifices. For the first time in her existence, the Phoenix felt a shiver of fear—a sensation so foreign that it enraged her.

"You dare challenge me?" she sneered, her cosmic flames swirling menacingly around her. "You are nothing compared to my power."

The Phoenix's eyes widened slightly as she felt something different about the mortal before her. His gaze, cold and unyielding, carried the weight of countless battles and sacrifices. For the first time, the Phoenix felt a shiver of fear. This fear, alien to her divine existence, fueled her anger.

The battle began, and the Phoenix held the upper hand from the start.

With a burst of energy, the Phoenix teleported above Ritsuka, raining down a torrent of fiery projectiles—each one a fragment of her divine wrath. Ritsuka, who had already assumed the form of Colossus with his skin turned to organic steel, braced himself for the impact. But even in this armored state, the sheer intensity of the Phoenix's fire was too much. The flames seared through his defenses, the pain forcing a grimace onto his face.

Gritting his teeth, Ritsuka extended his hand, using the telepathic abilities he had copied from Xavier to create a psychic barrier around himself. The barrier shimmered with raw mental energy, absorbing some of the impact from the Phoenix's relentless assault. Yet, even this formidable defense began to crack under the pressure.

The Phoenix's laughter echoed through the dimension. "Is this all you have, mortal? A shield of thoughts and steel?!"  The Phoenix laughed, her voice dripping with mockery as she gazed down at Ritsuka. "Pathetic," she taunted. "You think you can stand against me? Let me show you the true extent of your insignificance."

Without warning, she began to absorb his mana, drawing the very essence of his power into herself. Ritsuka felt his energy rapidly draining, his reserves depleted almost to the point of exhaustion. His knees buckled, but he gritted his teeth, refusing to fall.

Despite the loss of mana, Ritsuka stood up, his determination unwavering. The Phoenix, surprised by his resilience, teleported in front of him in an instant, her fist aimed directly at his face. But before she could land the blow, Ritsuka's hand shot up, catching her punch mid-air.

The Phoenix's eyes widened in shock—she hadn't expected him to be able to counter her so directly. With a swift, practiced movement, Ritsuka retaliated, driving his fist into her face with a force that sent her reeling backward. The strike wasn't just one of brute strength; it was born from years of close combat experience and training—something the Phoenix, with all her cosmic power, lacked.

"Not so invincible up close, are you?" Ritsuka muttered, feeling the surge of satisfaction from the successful hit. He had been through rigorous training, fighting in close quarters against enemies far stronger than himself. The Phoenix, for all her cosmic might, lacked the experience and skill in hand-to-hand combat that he had.

Angered and humiliated, the Phoenix attempted to blast him with a burst of her fiery energy. But in the blink of an eye, Ritsuka vanished, teleporting behind her. Before she could react, he unleashed a powerful blast of his own, a dark blue energy—an ability he had just copied from her.