Returning to the old riverbed, now damned off by the gnomes, the group travels along its bank, heading away from the dam. As they travel they notice that the river bed has a constant flow of water in a small channel cut in the bottom of the bed. The water is flowing very quickly and has many covers and small bridges. The water is purposely being channeled along the riverbed and the dam is controlling the flow rate. On this side of the riverbed there is a well worn path that you are on.
As they travel they run into more and more of the Deep Gnomes. Many are travelling as the group along the riverbed, some are engaged in repair and maintenance work to the water channel. As they travel they realize they are moving to ward the glow they saw earlier from the dam, like the sun had set and its last lights are silhouetting things in the underdark.
After several miles of travel there is a large area of darkness ahead, like a mountain in the dark. Tiberious speculates that it is a wall or mountain of rock. The glow which is now off to their right shows it as they draw nearer. A huge mountainous region rises into the darkness and stretches for mile in either direction.
Like a mountain on the surface, but with a very sharp face to it, like a shear cliff. It is lost in darkness of the ceiling but is so immense that it is most likely connected. The riverbed is heading directly into it. The path you are on is now a road well worn into the bedrock and having some obvious repairs in places
You are about a mile from the rock wall/mountain and the road you are on splits. There is a sign with a picture of a mushroom on it pointing to your right, off toward the glow. There is another one that says GLIMMERFELL in Gnomish with an arrow pointing straight ahead. You can see several carts moving off on the road toward the mushroom/glow. You continue
You pass more and more gnomes some on smaller carts pulled by large spiders, some on larger carts puled by lizards. All of them are wary of you, keeping an eye on you as you pass in the dim-gloom
The edge of the riverbank is now a well improved road and heading straight into the mountain.