Discolorations in the fog flash and wane all the time, so it is no surprise that it goes unnoticed in one particular spot. At least until the fog reaches out with eerie tendrils, grasping and pawing at people. Not objects, just people, wrapping around them and dragging them towards the everswirling and ominous fog. It seems like there is no escape.
Suddenly, with no explanation, the fog retreats, leaving aged clothing and dry skin in its wake.
The fog roils and sparkles, seeming to become thicker and more intense. It whirles and sworls, moving in somewhat ominously, slowly. And then after a while it pulses back out. That fog is really weird..