With Advent defeated and the Elders dead, Xcom becomes the ruling government of the earth and her colonies. While the former advent forces are taken under Xcom wings, not every alien is as friendly as them, so it's up to Xcom to do what it does best, and that's not miss a 95%. WOTC content being added. (Big)AU First Contact-3rd game. Xcom and Mass Effect Crossover.