Goblins.

As far as people know, goblins had originally survived and lived in caves and caverns close to the surface. Eventually, they emigrated deeper into the Beneath, making homes in dungeons and other subterranean constructions. While some people believe that goblins are intelligent and cultured creatures, most believe they are primitive and vicious-natured. Generally everyone agrees that goblins aren't fun to hang around--even other goblins. Each clan is controlled by a separate monarch, known as the Goblin King. These clans have been known to interact with Imperial officials, and while they are not directly connected to the Empire, they have been bullied and manipulated to work for the Empire as guards or spies in belief that it was to benefit themselves. Although some abovegrounders have claimed to make contact with goblins, contact is so rare that it is considered to be nonexistant. Some goblins have the ability to create wooden ornaments, which they will then sell and use the money to further better their clan.

Goblin movement is considered to be the most difficult to understand, as it is all based on the position of a Smitemaster's sword. As random as it is, many people have created theories on the goblin's movement, and a very respected Guild member summarized it into a simple math equation:

A goblin has the possibility to make nine separate movements - eight directions or wait. Before the goblin moves, each possible move is assessed and assigned a score. If moving to a particular square will kill the Smitemaster, then it is assigned a score of 50 000. If the move will put him beside the Smitemaster's sword, then the square is assigned a value of 5000. If neither of the above two work, then the score is calculated as V=50 000-100*d, where 'V' is the value of the square and 'd' is the distance from Beethro. Whichever square has the highest value will be the square that the goblin moves onto.