For this challenge, the word to use was phantom.
“Please,” I said, “please—“
He twirled his tail between his fingers. “Of course. I am a phantom of mercy.” He gave a lazy wave of his hand.
The images before me vanished, but I knew they would be there waiting if I closed my eyes. “Please, she's only a child. She doesn't need to die.”
“Indeed she doesn't. We can give you the power to save her, yes we can.” He leered. “Do we have a bargain?”
I licked my lips. “Yes.” My voice came out in a whisper.
His smile grew, showing pointed teeth. “Then your soul is mine.”