The World's Teeth

The World's Teeth are relatively close to the surface, serving as as sort of a unoffical border between Dwarven mines and the actual Underdark. Traveling through the Teeth is the only non-magical way to go deeper into the Underdark. Miners in search of fortune are often drawn to the Teeth, not because wanting to get to the Underdark, but because of the pure and highly condensed salt which make up the World's Teeth. However mining there is extremely dangerous because Bholes use this area as a spawning ground, leaving their children to feed on the salt. Any large operation could disturb and summon these children, which are much smaller then an adult Bhole, but still as dangerous. Other dangers include the Cave Fishers which hid atop the higher salt formations in wait for miners, andWhitemantles who use their bleach white color to hide on the salt formation. There are other creatures that sometimes venture into the Teeth to hunt, but because Bhole's use it as a spawning ground, only creatures that can hide, like Cave Fishers and Whitemantles, stay amongst the Teeth.

While the Teeth hold deadly creatures and is difficult to climb around, its most dangerous feature is the fact that any light source is amplified three fold because of the white salt formations that make up the entire place. Thus making sure creatures that want to eat you are well aware of your presence hundreds of feet before you are in sight. Another danger is slipping, as the World's Teeth are oriented downward and further into the Underdark, a slip will cause you to go tumbling down further and further as you are literally chewed up by the world. - Lasersniper