Long War of the Chosen is the most extensive mod for XCOM 2. Once you get into it, it's very difficult to put down, and you may never want to go with the vanilla game again. If you're going for the Long War, be prepared to spend hundreds of hours and don't get too attached to your soldiers. Get the base game by purchasing PC CD keys to XCOM 2: War of the Chosen. You can also pick up XCOM: Enemy Unknown and its expansion, XCOM: Enemy Within.
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