Playing Age of Wonders 3. It's brand new but feels very old school and is brutally hard. If you never heard of the series, think Heroes of Might & Magic. It's basically Civilization empire building coupled with very strategic hex-based tactical battles and lite RPG elements. So all the best things you can ask for together in one package
The battles can also reach quite large a scale with 7*6 units on the field in total. The graphics are quite excellent, though I hear some people complain about performance issues, it's running smooth as butter on my rig though. I can only imagine that people just equate turn based strategy with "runs on a toster".
I played the first two story missions so far and those alone took me 10 hours to complete. The third mission ended in failure in my first attempt. The AI is absolutely ruthless and will make use of every weakness you leave open. And so far the campaign didn't leave me the luxury of competing with just one enemy either, noooo, two front wars all the way.