Some Nora Roberts may be good. Go for her trilogies, they are most likely to involve supernatural elements. There is one called the Key series which is good---Key of Light, Key of Valour, Key of something else. The Pagan Stone is another but I have not read it myself.
Other authors you may enjoy:
Marion Zimmer Bradley (The Mists of Avalon series)
Terry Pratchett (Discword---not romance per se, but it has elements of that)
Gregory MacGuire (Wicked/OZ series---again, not romance per se but it has some)
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