How to complete Storm the Castle in MW3 Zombies

Have you been enjoying Modern Warfare 3’s Zombies? Do you like decimating hundreds of undead while using some cool weapons? Great, because we won’t be doing that for this mission.

Storm the Castle requires you to challenge the mercenary group Legacy and take down one of its top dogs—Warlord or Dokkaebi—then reacquire some vital research that will allow you to progress through Act Three’s missions.

Here’s how to complete Storm the Castle in MW3 Zombies.

Completing the Storm the Castle mission in MW3 Zombies, a guide

Storm the Castle is an Act Three, Tier Three mission in MW3 Zombies and has four objectives to complete. You’ll need to bust into a Merc Camp, then a Merc Stronghold, then the almighty Legacy or Dokkaebi Fortress to defeat its leader to complete this mission, so I recommend bringing a friend or two before starting.

Bring at least one Raw Aetherium Crystal to Pack-a-Punch your weapon of choice immediately, as well as a Three-Plate Armor Vest—you’ll need it for the Fortress.

Complete a Merc Camp

Step one: Find and complete a Merc Camp. These are numerous and quite easy to infiltrate and wipe out. Look for the Merc Camp icon on your Tactical Map, then head there and defeat every mercenary in the area. You’ll know you’re close if you see a Counter-UAV flying above. Watch for snipers as these guys demolish your armor and health.

Once all the mercenaries in the camp have been killed, look for the merc storage box in the middle of the camp as it will hold a Mercenary Stronghold Keycard, which you’ll need for the next step.

Complete a Merc Stronghold

The camp is pretty easy, but we’re stepping up the difficulty with the Stronghold. Normally a multi-story building, Merc Strongholds are packed with shock troops, riot-shielded mercs, and a reinforcement helicopter. Take the Keycard you earned from the camp, find the Merc Stronghold on your Tactical Map, and then clear out the building.

Like the camp, a Stronghold is only complete once every enemy soldier is eliminated. Some like to hide, so going in with a Depth Perception Perk-a-Cola will allow you to see enemies through walls. Hunt them down and you’ll finish step two—but don’t leave the area yet as you’ll need a Fortress Keycard to continue.

You can find a Fortress Keycard from the safe inside the Merc Stronghold. Interact with the safe to begin drilling, which takes about a minute. You’ll have to defend the safe from another wave of enemy troops, but once the safe is drilled you can withdraw the Fortress Keycard.

Option One: Defeating Dokkaebi at the Dokkaebi Fortress

If you get lucky and Dokkaebi Fortress is on your map, you won’t need a keycard to enter. Head to E7 on your map—the tallest building in the area with the cranes is the one you’ll need to enter. However, you can save yourself a lot of trouble if you head slightly west to the nearest building and take a zipline in.

The zipline to the roof sees you bypass the Wheelson and hundreds of bomb drones waiting for you on the ground floor, but make no mistake, only zipline in when you’re ready to take on the boss. She will send bomb drones and infinitely-spawning mercenaries at you, so make sure you’re well-kitted before taking this boss on.

After taking the zipline, clear the area and proceed across the roof. Head up the large circular staircase and into the small rooms at the peak of the building. Take out the sentry gun on the roof across from you and stay in cover near the ammo cache. After a few waves of enemies, Dokkaebi will emerge—eliminate her as quickly as you can.

I found an RGL grenade launcher to be most effective. The blast radius of the grenade instantly killed the drone swarm and dealt significant damage to Dokkaebi. Don’t forget to Pack-a-Punch it for the extra ammo reserves and damage too.

Option Two: Defeat Warlord at the Legacy Fortress

Defeating the Warlord will require you to infiltrate Legacy Fortress, which you can find at D2 on your Tactical Map. The fortress sits on a hill surrounded by concrete walls and is an absolute pain to break into. Only attempt this with a friend or with Pack-a-Punch Level Two weapons.

I entered from the east, taking down an anti-tank trooper and picking up his PILA rocket launcher to use against the attack helicopter that spawns once you start taking on Legacy. Bring down the chopper (it should only take you three to four rockets) then slowly move into the fortress.

The courtyard is packed with enemies, so take your time to clear the way before coming to the main building, which you’ll need the keycard to enter. Once inside, another wave of enemy mercs awaits you, as well as plenty of booby traps; suppression mines, claymores, inflatable decoys, and gas grenades are everywhere here, so again, use your Depth Perception to see these traps through walls before entering each room.

The Warlord uses Semtex grenades and a Dragon’s Breath shotgun in the final room at the top of the fortress. Clear the room of mercs then push up and shoot the Warlord quickly. He has no helmet so aim for the head and he’ll drop very quickly.

Collect Strauss’ Research

The final step of the quest is to collect Strauss’ Research, which will drop from the Warlord or Dokkaebi when they die. Players have reported Warlord sometimes won’t drop the research—if this happens to you, you’ll unfortunately have to exfil from the session and try again. As you don’t get to keep the Legacy Keycard, you’ll need to start at the Merc Camp again to break back in, but if you get lucky and get Dokkaebi, you’ll be able to immediately attempt this mission again.

Once you complete the Storm the Castle mission, you will receive the Malicious Marrow weapon blueprint and 3,000 XP as your reward.