Grimblekin are a type of intelligent beast that inhabit the wild areas of Dia. They are smart enough for some tool use and a basic language or roughly twenty to thirty words, but not to have any sort of oral tradition or culture. Grimblekin are small to medium sized humanoids covered in ridged, tight, skin with long claws on each hand and foot. Their heads contain a pair of short horns used in mating displays. They generally eschew clothing and weapons, if any, tend to be bone clubs.

Grimblekin will happily infest any location they can find that provides cover and the opportunity for an ambush. They live in rough communal groups lead by an Alpha mated-pair, usually the largest and most vicious male and female of the pack. A fully established colony can have up to fifty individuals, but such groups can often break up as a challenger will attempt to gather support before confronting the leader. If a decisive (and fatal) resolution is not achieved, the defeated party will flee, leading to another colony of Grimblekin founded somewhere else.

Not every Grimblekin encounter is a colony. Hunting groups of Grimblekin will raid out far and wide, ambushing sentients and animals alike for fresh meat.