House Medani across the face of Eberron. While all members of House Medani are half-elves, not all members carry the dragonmarked Mark of Detection. House Medani contains the Warning Guild, though anyone working for the guild is not immediately considered a member of House Medani. Because of their Mark of Detection, they are the premiere anti-spy organization in Eberron. They are based out of Wroat in Breland, but have enclaves across the continent of Khorvaire.