"Very big, for one thing. Well, they look very big, actually they're sort of a fleshy oyster-thing in a massive rock suit. Peaceful society, for the most part, they live in cavern-palaces on their home plane and eat crystals. They have power over earth and stone, which I get a bit of-" he picks up a rock and, concentrating, turns it into a picture-perfect robin- "and human crosses get strength and toughness and that whole package. That's true of most half-demons, human blood plays very nicely with demonic."