Grimlocks are a fierce race that dwell in the dark and hidden places of the earth, periodically issuing forth to the surface in search of prey, preferably human. Whilst somewhat resembling men in shape, they have a thick, almost scaly, hide that is a dusky grey in colour, a head of wild and matted black hair, a mouthful of vicious pointed teeth and two white featureless orbs for eyes.

Though it is unknown whether grimlocks speak a language, it is certain that they are entirely blind as a race. They instead rely on their other senses, which are highly developed and allow them to perceive the environment around them within a 20-ft radius with astounding accuracy. Their blindness also protects them against the effects of bright light or other visual stimuli that might otherwise adversely affect them, including magical effects, such as invisibility, darkness and any visual illusions. However, grimlocks are also known to be particularly vulnerable to effects that obscure their other senses, such as overpowering scents or overloud noises that have a significant duration. When exposed to such hindrances, their perception is reduced to a 10-ft radius and they suffer a -2 penalty to hit.

Grimlocks show very little grasp of tactics or strategy, preferring to attack directly and all at once. However, they do seem to prefer to fight under cover of darkness, which often yields to them a distinct advantage. Although they are capable of inflicting 1d6 damage with their filthy claws, most prefer to use axes or swords. Regardless of hit dice, grimlocks always make saving throws as 6th level fighters and have +1 to surprise rolls. Indeed, they are so well adapted to their environment that they are virtually undetectable when motionless, if initially unobserved.