Again, to be safe, we shall have the official disclaimer:
|The material presented here is my original creation, intended for use with the GURPS system from Steve Jackson Games. This material is not official and is not endorsed by Steve Jackson Games.
The Danu are giants, standing around 9 feet tall, but otherwise, they look like muscular humans. They live underground; specifically, they live in communities called 'sheehers' which translates roughly to 'hollow hills.' They find a hill, dig a passage down to the centre of the hill, and then tunnel a massive underground city off of that first passage. In essence, they build massive underground settlements vaguely similar to anthills, but they always have a single entrance/exit, which must be bored into the side of a hill.