Book 4 of Craft Cycle, First Last Snow.
Interesting thing, they are titled in chronological order, although written and published in the order of 3, 2, 5, 1, 4. I am reading them in publication order. Oh, and I guess vol 6 (Ruin of Angels) came out a few years after the first 5, and is also chronologically after vol 5.
Since my to-read list is 1400+ books long, I doubt I'll ever go back and read them in their internal chronological order... Regardless, right now I am reading my 4th Craft Cycle book, which is the first in the internal chronology. I'm interested to see what events here will be echoes in the other books I've already read... I'm excited that I have the other two already, so I can just read those right after.
To which, I finished Full Fathom Five, the 3/5th book in the Craft Cycle earlier this week. I just love the "modern except for the magic thing" he's doing. The whole part about the main character basically getting demoted from the priesthood and moving to the "pilgrim relations" team sounded a LOT like someone getting moved from Engineering to the Sales team. The line "I spent the morning memorizing the acronyms" is just so great, when there are literally floating towers and GODS running around the setting.
Anyway, this is either your jam or it's not. I think it would appeal to fans of China Mieville's Bas-Lag novels like Perdido Street Station. Could there be a Craft RPG? Often there are multiple characters who eventually team up - I think it definitely could. I'd play it.