Take command of the Avenger, an alien supply craft converted to XCOM's mobile headquarters. Guide your strike force around the world, build popular support and expose the aliens sinister plans. Five soldier classes, each with its own skill tree, let you create specific soldiers for your tactical plan. Guerrilla-style tactics offer more flexibility in combat. The state of the world affects each combat mission's environment. Use concealment to ambush enemy patrols. Loot enemies for precious gear and artifacts. Rescue VIPs and save fallen comrades by carrying them to the extraction point. A diverse cast of enemies, from powerful new alien species to the ADVENT, enforcers of the alien regime, offer a distinct tactical challenge.