The Shadow War
The Cogs are the industrial district of Sharn. It is populated by an underclass of humans, dwarfs, halflings, goblinoids, and anyone who does not want to be found. The Cogs are a dangerous place, as it is sitting above a planar junction of Elemental Fire, which provides most of the power for its factories. The Cogs are rife with gangs, monsters, and loose elementals that have escaped into Eberron.