Tabletop RPG resolutions

One of my side-projects that I sadly get to spend less time on than I’d like, is a tabletop RPG system. It was originally intended for a dark urban fantasy setting (and another side-project that hasn’t seen any love for quite a while), but has grown past that. Anyway, I can get back to the worldbuilding elements and how it ties into mechanics another time because right now, I’m trying to decide on tone and the core resolution mechanic.