[Keeper of Dol Guldur]

Magic to who though? To hobbits? Everything is magic to hobbits. The druedain were connected to the earth in a much closer way than the edain, and how the Paths of the Dead were carved is beyond me. (Did the Numenoreans carve it? I need to refresh my trilogy notes), anyway, the dwarf magic was in the runes they wrote, like the doors of Durin, which not only acted as passwords and were wrought of magical elvish ithildin, but kept the doors from ever wearing away. Or hid keyholes from sight and touch, and similar things to that. I don't think shape-shifting was a common magic.

Someone had a good thought about Beren and Luthien, but I'd have to disagree. I think the Silm specifically stated that Dior was their only son (although who 'really' knows about daughters.)