I have not read those. I'll take a look.
Basically its Games of thrones meets the Outer Gods. There is also very nice nod to Robert W Chambers King in Yellow. One of the best fansy trilogies ive ever read. and I hope revisits the world of Kagan at some point down the line. He's been writing scince 1978 . He writes fantasy , Science Fiction and Horror quite a prolific writer . I also recommend his Joe Ledger series of which I just finished book one Patient Zero