Castiel came back from opening the purgatory gate, and you happily welcomed him back with a big, beaming smile. The joy on your face was palpable - you had been worried for him, and to see him return safely was a tremendous relief.

But your happiness was short-lived, as Castiel's expression shifted dramatically. The warm, familiar gaze you were accustomed to was replaced by a cold, piercing glare that made you stop in your tracks. It was different from his usual blank, confused stare - there was a sense of power, of authority, that radiated from him, and it sent a chill down your spine.

"The Castiel you knew is gone," he said, his voice devoid of any warmth or compassion. He looked down upon you, a subtle yet unmistakable air of superiority in his bearing. "I am now God, and you shall bow before me."