You can fall back to high cover and roof tops, leaving some well positioned soldiers on overwatch. Try not to let him take 2 actions from high cover, which allows him to mark then shoot, which is very dangerous. The Advent Officer is very dangerous, but if he is flanked or out of cover, he will often just move and mark. Grenades are crucial on this mission, but you only get 4. Some other tips:īeware of mind control prioritize killing the sectoid. If the enemy does not come to you, then you may want to move forward cautiously, 1-2 tiles a turn, then enter overwatch. It is critical to not trigger both of the remaining pods at the same time. Then you need to stay put, reload and overwatch, hoping the 2nd pod comes to you. The grenade will wound all of them (usually kills one) then any hit will finish off the enemy. You can initiate the ambush with a grenade while the other soldiers are on overwatch.

To do this, it is best to get on top of a building for the height advantage. For the Gatecrasher mission, it is very important to get a good ambush from concealment and eliminate the first pod you encounter without taking injuries. The first few missions in WOTC are very difficult. Getting through the first month - Gatecrasher:

Xcom 2 wotc weapons