A good fantasy series can potentially go on forever. Series like the The Wheel of Time or The Dresden Files easily tell a dozen books worth of story. However, a great fantasy series knows it’s ending, even if takes a while to get there. Jim Butcher has stated he knows the ending for The Dresden Files and how many books the series will contain. The reader can see that the story is leading somewhere definite. Even if the ending suggested in book one is now the ending for the entire series, it still suggests a finality. Jennifer Estep’s Crown of Shards series is only two books in, but we already have a sense of where the ultimate plot is going. Machinations have already begun and there is a clear-long term villain. Ultimately, it is always possible for a series to arrive at its first ending, and realize there is more story to tell. With great fantasy, there is a sea of endless possibility that allows characters to develop and keep the plot always interesting.