According to Steven Erikson's new website, sales of the ten-volume Malazan Book of the Fallen series have now passed 3 million.
Erikson started publishing the Malazan Book of the Fallen series in 1999 with Gardens of the Moon and completed it in 2011 with the publication of The Crippled God. He has also written six spin-off novellas (The Tales of Bauchelain and Korbal Broach), two prequel novels in the Kharkanas series and is now working on a sequel trilogy, called Witness. His co-creator Ian Cameron Esslemont has also published eight novels in the same world (the six-volume Malazan Empire sequence and the first two books of a series called Path to Ascendancy) and is working on more. These figures apply to the original ten-book series alone.
Sales of the series passed 1 million in 2012, which was quite a long time, but the fact that the series has tripled its sales in just six years is very good going. Erikson's sales are of course better than 99% of authors will ever experience, but he's still a fair way off the likes of Robert Jordan's Wheel of Time series (sales c. 90 million) or Terry Pratchett's Discworld (sales c. 85 million). Erikson's first novel, Gardens of the Moon, is infamously a novel that many readers find "difficult" to get into, so it's even more impressive that so many readers have stayed the course and gotten into the whole series.
The reasons for the booming sales in the last few years may be down to social media, such as strong recommendations for the series on Goodreads and Reddit, and also the fact that the original series is both long and complete, making it an appealing alternative for epic fantasy fans waiting for the next Song of Ice and Fire novel.
The next release in the Malazan series will be The Tales of Bauchelain and Korbal Broach: Volume II, which collects the fourth through sixth Malazan novellas. It will be published this autumn. Ian Cameron Esslemont's third Path to Ascendancy novel, Kellanved's Reach, is due in 2019. Erikson is now working on The God is Not Willing, the first Witness novel, with no publication date yet set.