Mercer/Raziel was getting annoyed at the human, and shifted his gaze over his shoulder to see if anyone was paying enough attention to prevent him from grabbing him. Then he smiled, as though he were slightly embarrassed.
"I say he broke it just to simplify. The blade was a projection of my mind. My very being." He tapped his forehead to emphasise. "That... creature, he was able to do something to me. He attacked me with his tendrils, and tried to expand them. I repelled him with fire, but the damage was done. I do not know why, but I have been unable to project it since then." He scowled. "As to who I am, I have no name. Not any more. With the loss of that part of me, I am not the same being now that I was before."