No one really knows what this thing is. A Shadow Creature? A Spirit? A form of the undead? It appears to resemble a skeletal Dragon, but...the skeleton doesn't quite match up with the correct structure of an actual Dragon, but this is not visible at first glance.
The creature's name appears to mean either "quietness" or "stillness".
It never makes a single sound. Never. Not when it flies, not when it walks, and not even when it opens its jaws in what is probably an attempt to speak. Not that it needs to. Its glowing, golden eyes say far more than words ever will.