Deverry Cycle

Deverry Cycle is a twelve-book series, but don't panic, it's broken up into "cycles," so every four books or so you get a satisfying ending. The heavy Celt flavor is delicious, and its unique, non-linear style is pelted with flashbacks as Kerr tells the story of souls reincarnating through time, sometimes reborn into a different gender. At its core, it's about Nevyn working to set things right for Jill, not Jill as a driving force in her own future, so it's not high on the list. Being written in the early 90's it has some irritating stereotypes that persist, and the women are constantly tossing their heads in annoyance, but there are some strong heroines at times. Lady Gweniver, warrior of the goddess is fantastic. The dweomer magic, the Wildfolk, the Westfolk, and the dwarves are a nice comfort fantasy element, themes of incest, incidents of pedophilia and gay rape pop up, so it's definitely adult material.