Malazan Book of the Fallen series is great, also has a lot of standalone novellas written in the universe. I've probably brought it up before.
The main series has ended, but Erikson is writing a prequal trilogy (The Kharkanas Trilogy) involving the history of some of the races involved in the main series (covering events that are referenced in there). The first two have been written, and I've recently started the second one.