I read Illusion of Thieves
when it first came out as I love Berg's work, and I did a mini review here in 2020
when I read the sequel.
As I mention there, I actually enjoyed the novel more the second time around, but I do agree about the dark moments and the troublesome aspects. The sequel, A Conjuring of Assassins
, however, felt a lot lighter in tone, and from memory I don't think those aspects, while not ignored, played as big a part, so it might be worth looking at notwithstanding your concerns. I think, too, you might be interested in the divination, which to me (in my undoubted ignorance of the whole subject!) seemed a cross between Tarot and I Ching.
I wasn't so impressed by the third novel in the series, which goes off at a different angle about the city and I kept getting lost in what at the time I thought was a convoluted plot, but I might give that another go this year, to see if I get on with it any better now.