Marauder is possibly the hardest boss until this point in the game. The boss fight happens at Mission 6 at the Arc Complex to complete the objective to Get Samuel Hayden. This walkthrough shows how can be completed at Nightmare difficulty. The best tip to pass through it is to use the Super Shotgun and keep Marauder always on your screen. Use the adds to refill armor and ammo when needed. As you learn the timing and distance of the boss, things will get easier.
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