Gree’s Knights and Dragons is a free to play game that has earned an absolute ton of popularity over recent months. It’s a traditional fantasy RPG that also incorporated elements of city building into the mix. Then it adds a ton of polish to create one of the most well executed games of recent times.
If you take the traditional RPG and splice it with a city building game, you’re pretty much left with Knights and Dragons. You build your city. You then get lots of different resources that help your characters to level up. Then you head into combat against all different manner of beasties. Or, if you can’t be bothered to wait, you can just hop into the game’s store and purchase stuff.