Memory:Ancient Chaos Wyrm

This creature is more than a dragon, and less than it: the enormous reptilian head and the great scaled torso give it distinct draconic features, yet it looks as though it never had grown wings and it only has one pair of legs close to the head. As you look closer, it looks less and less like a dragon: the legs are thin and bony, almost like those of a bird, and as you watch, the shape and features keep shifting. Parts of the skin suddenly grow hair, which then transforms into feathers, then into a weird crust, then into translucent smooth skin, then into the surface of a dark slimy liquid... and the collar behind the head grows and absorbs snakes' heads, tentacles, long trembling spider legs, stiff thorns and leathery strings lashing at the air. You realize that the wyrm must be at least in part a creature of chaos itself and probably part of it always resides in the realm of chaos. Although it might be impossible to kill it outright in this world, you're determined to make it give up its abode on this plane.