Slaine - A Role-Playing-Game of Celtic Heroes - About Dwarves

I was wondering if anybody has homebrewed extra information about Dwarves that wasn't given in any of the source books. What I do know about them is that they are more like goblins in appearance (Warhammer Fantasy Goblins) and they are descended from Elves. They are not exactly like the Dwarves of Tolkien universe. They don't always have facial hair or even great big beards and their origins are unknown. I'm not sure if they have a hidden city some where in Tir-Nan-Og, but I would love to know where they congregate exactly?