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The Vampire Academy series Von Richelle Mead (#1 Vampire Academy, #2 Frostbite, #3 Shadow Kiss, #4 Blood Promise, #5 Spirit Bound, #6 Last Sacrifice)-vampires (moroi & damphirs)

The Harry Potter series Von J.K. Rowling (#1 The Sorcerer's Stone, #2 The Chamber of Secrets, #3 The Prisoner of Azkaban, #4 The Goblet of Fire, #5 The Order of the Phoenix, #6 The Half-Blood Prince, #7 The Deathly Hallows)-witches/wizards and other stuff

The Immortal Beloved series Von Cate Tiernan (#1 Immortal Beloved, #2 Darkness Falls, #3 Eternally Yours)-immortal & magical powers

The Darkest Powers series...

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Kabouter (Dutch) - Little people that live underground, in mushrooms, oder as house spirits
Kachina (Hopi and Puebloan) - Nature spirit
Kage-onna (Japanese) - Shadow of a woman cast on the paper doors of a haunted house
Kahaku (Japanese) - Little people and water spirits
Kajsa (Scandinavian) - Wind spirit
Kalakeyas (Hindu) - Descendents of Kala
Kallikantzaroi (Greek) - Grotesque, malevolent spirit
Kamaitachi (Japanese) - Wind spirit
Kami (Japanese) - Nature spirit
Kamikiri (Japanese) - Hair-cutting spirit
Kanbari-nyūdō (Japanese) - Bathroom spirit
Kanbo (Japanese) - Drought spirit
Kanedama...