The celestial being’s power radiated across the battlefield, a force so overwhelming that even Castiel, with all his angelic strength, struggled to withstand it. The sky above crackled with energy, and the ground beneath trembled as the being prepared to unleash its final, devastating attack. Castiel steeled himself, knowing that this could be the end—but just as the attack was about to strike, you threw yourself in front of him, your body glowing with the last remnants of the protective sigil you had inscribed.

"No…" Castiel’s voice was a mix of disbelief and horror as he watched you absorb the blast meant for him. The force of the attack sent you sprawling, the protective sigil burning brightly before fading away. Castiel was at your side in an instant, his grace flaring in desperation as he tried to heal you, but the damage was too severe. "Why did you do that? I could have—"

"You’re the only one who can stop this," you whispered, your voice barely audible. "I had to protect you, Castiel. The world needs you more than it needs me." Castiel’s heart ached at your words, the weight of your sacrifice settling heavily on his shoulders. He had always seen himself as a protector, an angel who watched over others—but now, he was the one being protected, and it tore at his very essence.

"I will not let your sacrifice be in vain," Castiel vowed, his voice filled with a quiet determination. "I will finish this, for you." He placed a gentle hand on your forehead, his grace attempting to ease your pain, but he knew that there was little he could do to reverse what had happened. The celestial being still loomed above, its power undiminished, and Castiel knew that he had to act quickly before it could strike again.

With a final, sorrowful glance at you, Castiel rose to his feet, his wings unfurling as he turned to face the celestial being. Drawing on the strength of your sacrifice, he channeled his grace into a powerful surge of energy, determined to end the battle once and for all.