There are a few obvious choices here, and I’d place them in no particular order.
- Alan Campbell’s Gravedigger’s Chronicles. Book #2 ends well but this is a clear trilogy, where the issue with the flooded planet needs to get at least partially addressed. Unfortunately, Alan Campbell announced he won’t write books anymore and just quit.
- The Thraxas original series of 12 books didn’t reveal the origins of Thraxas and Makri. Book 13 was promised and not delivered.
- Patrick Rothfuss stormed the world with his Wise Man’s Fear book. Kvothe, supposedly, already told his story but not to us. 15 years later, book 3 remains unpublished. It is very unlikely that we see anything other than another short story or a prequel.
- The Rithmatist by Brandon Sanderson introduced us to a duo of young sorcerers who could create living glyphs. It is called a series but it is a series of one book. Second one never materialized.
Out of these, I think I regret the Gravedigger’s Chronicles the most. It was such an absurd idea, deserved to be wrapped up.
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