Modern Warfare 3 Zombies' third act of story missions will force players to think strategically and fully gear up before attempting the objectives throughout the five tiers of missions. One mission in the second tier of Act 3 - Confrontation, will require players to kill different types of enemies while under the active effect of the Aether Shroud field upgrade. With no upgrade function for the field upgrades like Call of Duty: Black Ops Cold War, players will only have a few brief seconds under the shadow of the Shroud to rack up kills.