Fey
There are a large number of different tyes of fey, many which can be considered elementals of one type or another. Fey in general are known for keeping their word whilst twisting deals to the limit of the wording. They dislike iron.
The fair folk are the source of the rules of hospitality, however most other fey follow these rules as well. If you can get them to accept you as a guest, you will not be in danger unless you break those rules.
Known varieties of fey include: