Genies

A Genie is a wish-granting spirit or Demon of near-omnipotent might (though below the ranks of deities or angels) - these beings can be good, neutral or malevolent but share a common trait of granting people wishes, often at a high price...

Malevolent genies tend to twist wishes to do harm to their victims, neutral genies can harm victims with "literal" examples of a wish and even benevolent genies could cause harm if a wish was reckless or greedy.

The term can also be used for exceptionally powerful sorcerers, supernatural entities (such as fairies or elves) and even reality-warping mutants/meta-humans that can achieve sufficient feats of power to grant wishes.