The Dresden Files: Portland
The Fomor are an ancient race of water dwellers. They may be the Fomorians of Celtic mythology, who appear as adversaries in many stories involving the Tuatha De’ Danaan.
Whatever their origins, they’re known as formidable sorcerers, shapeshifters, and seers among their supernatural peers. much of their trade among the supernatural community apparently involves shaping of flesh into different, twisted forms. Though they don’t often become involved in mortal affairs, they have no qualms about keeping human slaves for their purposes altering the slaves’ biology and conditioning them into servitude.