Hello all. This is my first mod. I edited the file RazeCity.lua based on Remgrandt's one city challenge mod to make it optional to keep the Capital or Raze it! (I know, Yay!!)

installation:

back up your original RazeCity.lua file located in /assets/Base/Assets/UI/Popups/

then unzip the file and copy and replace to the location above. 

Enjoy.