XCOM 2: War Of The Chosen is an expansion to the original XCOM 2 game that adds more than just missions and hero classes. It also changes the way the game plays so that you may rely on strategy a little more, which helps to give the game a little more depth. The expansion includes new hero classes to help you defeat Advent. There are also new enemies to defeat, new environments and new missions to try. There are three new hero classes, and each class comes with its own philosophies and own unique abilities. Obviously, you need to own and have installed XCOM 2 in order to play XCOM 2: War Of The Chosen.