Crusader Kings II: Horse Lords
This isn't a DLC. Again, due to crazy trend of modern days, expansions, add-ons and add-ins are mislabeled as DLC. This is an actual expansion for the game and probably one of the meatiest from the bunch. Adds a lot of new gameplay mechanics, changes the world, allows you to play a lot of new nations and improves the existing gameplay.
Definitely something to grab if you own CKII
by wolfsrain, Romania - Sep 8th 2015