Cog is a huge mechanical city built in the Desert of Tears. It was built by the Sand ages ago as a sister city to their capital. When they were destroyed it was left to be run by their golem servants. Over the years though, without orders from their creators, the golems became self-aware. They often claim Cog as a spiritual homeland but in truth it is all but inaccessable to them as it is run by a Golem of great power and intelligent fury that names itself Lord Cog.
Whatever secrets and ancient relics Cog holds are captive to the whims of Lord Cog and his golem army.