I like a subtle, sneaky spell like this. It works more like magic in real world folklore than in a comic book or movie...
Instead of answering, the cold-eyed man traced a figure in the air, and the figure seemed to stand glowing as he traced, stirring some buried memory deep inside her. Behind her eyes, she felt something break, like a twig snapping. She would teach him to play his magical tricks with her. She started for the dark man...and stared with amazement at her feet that would not move. They did not feel held, they had full sensation, but they would not move.
"What wizardry is this?" she demanded hoarsely. "Release me, Amanar, or--"
"Throw the sword aside," he commanded.
She stifled a scream as her arm obeyed, sending the jewel-hilted tulwar skittering across the mosaicked floor to ring against a column.
Amanar nodded in satisfaction. "Remove your garments, Karela."
"Fool," she began, and her green eyes stared with horror as her slim fingers rose to the golden pin that held her scarlet cloak and undid it. The cloak slid from her shoulders to the floor. "I am the Red Hawk," she said. It was little more than a whisper, but her voice rose to a scream. "I am the Red Hawk!"
She could not stop watching with bulging eyes as her hands removed the golden breastplates from her heavy round breasts and casually dropped them, unfastened the emerald girdle that rode low on her flaring hips. "Enough," Amanar said. "Leave the boots. I like the picture they present." She wanted to weep as her hands returned quiescent to her sides. "Beyond these walls," the black-robed man went on, "you are the Red Hawk. Inside them, you are...whatever I want you to be. I think from now on I will keep you thus when you are with me, aware of what is happening. Your fear is like the rarest of wines."
"Think you I'll return once I am free?" she spat. "Let me get a sword in mt hand and my hounds about me, and I will tear this keep down about your head."
His laughter sent shivers along her bones. "When you leave these walls, you will remember what I tell you to remember. You will go believing that we conferred, on this matter or that. But when once again within this donjon, you will remember the true nature of things. The Red Hawk will grovel at my feet and crawl to serve my pleasure. You will hate it, but you will obey."
"I'll die first!" she shouted defiantly.
"That will not be permitted," he smiled coldly. "Now be silent." The words she was about to speak froze on her tongue.
Behind her eyes, she felt something break, like a twig snapping.
"It is his soul!" a voice boomed, seeming to come from every direction. Among the shadows along the columns on the far side of the chamber, one shadow suddenly split, folded, and thickened. And there, before them, stood Imhep-Aton.