@Gator - That's probably due to the Settlements Wxpand the Under-Empire mod. I think I can add an MCT setting that will let under-cities persist/spawn under your own settlements without much effort. I'll look into it this weekend.

Hey bud I've been using your mods for a long time, but in a giant list of others. Previously, your mod worked just fine with the mod "Control your own Criminal Underbelly", which allowed for you to retain undercities in cities you conquer that already have them. These changes you have made have ceased the compatibility. Of course, it's OP as hell to have your own undercities so not a huge deal, but if there is an easy way to make them compatible or create something like that of your own, as an avid Skaven player I would testify that many people would like it.

Great mods.