The dark creature finishes its stretch and stands straight again.  As it does so its body undergoes a final change: it increases in size until it stands 5 feet tall at the shoulders and is 12 feet long without including its tail; it's dark shape becomes real as it suddenly has fur, gains a little more color where it belongs, and light now hits it.  It turns towards the only one nearby who addresses it, slit pupils settling on the elf.  "Took over her body?  Try the demon who's been trapped in her body for the last twelve years.  I'm not sure what she did to loosen the bond, but at least I can move again."  As if just now realizing she - from the sound of her voice - might not be welcome, she glances about at the others present.