A large somewhat reptilian looking being with curved horns, a wide toothed maw, dark leathery skin, and a large single malevolent eye.  It stalks the city seeming ill at ease amidst the civilization.  The creature tends to use its physical prowess to win conflicts, but if pressed it can conjure forth curses and aberrant dark magic.

Some scholars might consider this creature to match the description of an ancient race of beings who lived on the primordial world before the light of the sun was ignited.  In that gloomy twilight they built a great civilization to the glory of the old gods.  When the light came, and with it new gods and beings, their works were cast down.  Their existence was cursed and their civilization crumbled into myth.  These ancient beasts curse the light and stalk the shadows, plotting to rise up again and snuff out the sun.  There are tales of them emerging from fog and mists to carry away wives and daughters to use to breed a new army, some curse or misfortune making none of their kind female.  One day they might tear down the works of the new kind and slay their gods, but for now they stalk bitterly through a world that has no place for them.