You need to remove the timer and get your head out of your -blam!-. This mission is already hard enough without losing all your lives right after you get to the boss.
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This one is the worst one. Enemies hits way to hard and you are somehow supposed to kill a couple with a peashooter. All of the other Conquests are way easier than this one. The enemies don't deal as much damage and you are not forced to use a weak taken ability.