In a universe where mutants and cosmic forces collided, a cataclysmic event was about to unfold. Scarlet Witch, the powerful void mutant, found herself face-to-face with the Dark Phoenix, a cosmic entity of immense power and destruction. The clash of their energies threatened to tear reality apart.

Scarlet Witch, driven by her desire to protect the world, knew she had to act swiftly. With her reality-warping abilities, she mustered every ounce of her strength and focused her powers on the Dark Phoenix. As their energies intertwined, a blinding explosion enveloped the space around them.

The explosion released a surge of chaotic energy, ripping through the fabric of the cosmos. The immense power caught the attention of Dormammu, a Celestial being trapped within a dormant state. The explosion acted as a catalyst, awakening the ancient entity from its slumber.

As the dust settled, Scarlet Witch and the Dark Phoenix found themselves in a realm of endless darkness. They stood on a floating platform, surrounded by an infinite black void. It was a place where time and space were distorted, and the laws of physics no longer held sway.

Scarlet Witch realized that her confrontation with the Dark Phoenix had inadvertently triggered the regeneration of Dormammu, a being known for its insatiable hunger for power. The endless black hole was now infused with Dormammu’s essence, growing in strength with every passing moment.

The Dark Phoenix, sensing the threat Dormammu posed, turned its attention away from Scarlet Witch and redirected its destructive force towards the Celestial being. Flames of cosmic fire engulfed Dormammu, but it seemed to only fuel its power further. Dormammu absorbed the energy effortlessly, growing more powerful by the second.

Scarlet Witch knew that she had to act swiftly. She tapped into her connection with the void, calling upon its mysterious energy. With a surge of power, she created a barrier around herself, shielding her from the all-consuming darkness. Scarlet Witch concentrated her powers, focusing on the infinite black hole created by Dormammu’s regeneration.

She channeled her energy into the void, creating a counterforce to Dormammu’s insatiable hunger. The void expanded, pushing back against the consuming darkness. Scarlet Witch’s power clashed with Dormammu’s, creating a cataclysmic battle of cosmic proportions.

The clash between Scarlet Witch’s void energy and Dormammu’s regenerative power created shockwaves that reverberated through the black hole. Reality itself trembled under the strain. Scarlet Witch poured every ounce of her strength into the battle, knowing that the fate of the universe hung in the balance.

As the battle raged on, Scarlet Witch’s power began to overpower Dormammu’s regeneration. The void consumed the Celestial being, slowly diminishing its presence within the endless black hole. Dormammu’s hunger was quelled, and its power waned.

With one final surge of energy, Scarlet Witch delivered the decisive blow. The black hole collapsed upon itself, trapping Dormammu within an eternal prison of its own creation. The endless darkness consumed Dormammu, leaving only a faint echo of its presence.

Scarlet Witch, drained but victorious, emerged from the black hole’s remnants. She glanced at the Dark Phoenix, now weakened by its battle with Dormammu. The cosmic entity, sensing defeat, retreated into the depths of space, leaving Scarlet Witch to contemplate the consequences of her actions.

As the universe regained its balance, Scarlet Witch realized the immense responsibility she carried. She had unleashed and tamed an ancient Celestial force, preventing it from wreaking havoc upon reality. She vowed to use her powers wisely, to protect the world from threats both known and unknown.

And so, Scarlet Witch, the void mutant, stood as a guardian of the cosmos, forever bearing the weight of her actions and the knowledge that she had confronted the Dark Phoenix and regenerated Celestial Dormammu within an endless black hole.