Xenoblade Chronicles 2: Torna - The Golden Country is a must play for everyone that has finished and has enjoyed the base game. This game is a prequel that goes more in depth about the Aegis war, the characters of Jin and Mythra, the Torna titan and his civilization. The story is incredible and the gameplay is well done, I personally still prefer the original game one better but this one is great and fast from the start.
This DLC is a full game by itself, it’s about 25+ hours long, and full of great side quests.