They are restless spirits of lost miners haunting a mine in Edron. Interesting enough, even though their location is connected to quest, everyone can enter the mine and face these creatures. Since they don't have the Life Drain spell and they heal like Ghouls, these creatures are perfect for training. They were added with the Christmas Update 2009.
Damage Taken From Elements
Since they don't appear in packs, they can be killed easily as you would kill a single Ghoul.