Underdark Spider's Bridge

Publisher's blurb: A stone bridge spans this misty, seemingly bottomless, underdark pit. Giant cobwebs cling to its underside, as well as coat the surrounding edges of the gorge; waiting for those who slip or wander foolishly into their grasp. The surrounding cliffs are bare, crumbling stone. Fallen rocks litter the narrow walkways, while you can hear strange clicking noises echoing up from the seemingly bottomless caverns. If you need to cross to the other side, pray nothing notices you.