I am a sentient being that can take on the shape and essence of any living being or inanimate object. I only become a copy of whatever shape I take, I don't replace the original.
My most common shape is that of a wraith that walks in the moonlight. Humans and other beings who see me in the night are frightened because they do not know me, but I mean them no harm.
I float around the ramparts of the great city, Alasgrah, looking out to the desert, watching and waiting for my new ward. Her name is Xian, and I am charged with her guardianship and safekeeping for a week before the moon turns crimson. After that, it will be up to het to decide what she wants to do.