Daughters of the moon is a good 13 book series...took the author 3 years before releasing book 13
Daughters of the Moon is a novel series by Lynne Ewing. It is about four girls, later about five, who are mortal goddesses and fight an ancient evil called The Atrox. They each have different powers, destinies, and dark sides. They all wear moon amulets. When they turn 17, they have to make a choice. They can either become guardian spirits or continue their lives – but as mortals who have forgotten their lives and consequently, their powers, as Daughters of the Moon. All of the Daughters live in Los Angeles, battling the Atrox and its dark Followers.
here are the books in order
bk1.Goddess of the Night
bk2.Into the Cold Fire
bk3.Night Shade
bk4.The Secret Scroll
bk5.The Sacrifce
bk6.The Lost One
bk7.Moon Demon
bk8.Possession
bk9.The Choice
bk10.The Talisman
bk11.The Prophecy
bk12.The Becoming
bk13.The Final Eclipse
is all there is , and there are also follow up series...after em..of different people and chars but its based upon the same storyline as the Daughters of the Moon..
it also does have some sexual content and does mention self harm