[ Phantom tilts his head, considering Eustace's question for a moment. ]

'tis both. Mine shadow manifested as an external entity due to the effects of my cursed power. Even if it can separate from my body, it still remains a part of me in spirit. We are inseparable, as light and dark, as night and day. I would imagine that your own shadow takes a different form from mine, not of the Crimson Diamond, but another that is closer to your heart. Perhaps your world lacked the means to bring it into the physical realm - this world, a world of dreams, was in turn able to give it a voice and body.