While most of the special weapons in Dead Island 2 are hidden behind side quests, you can get the Extinction Event pistol as part of the main story. In order to get the Extinction Event, players need to complete the Justifiable Zombicide mission, which players need to complete right after the Michael Anders and the Holy Grail mission

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As part of the mission, players not only get the Extinction Event pistol but also 6,000XP and a Blueprint, Uncommon Ranged Puncturator Mod. Once you are outside the trailer after finding Michael, the mission starts automatically, and here is everything you need to know about completing the mission.

Getting Through The Mission

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Once the previous mission ends, head inside the door right beside the spider. Go past the area and then through the green door to reach a radio. Use the door in the area to head back to Beverly Hills. You will come across a locked gate, and upon inspecting the nearby journal, you will get to know that Phil has the key to the door and you need to locate him.

Go past the fence and you will be greeted by a few zombies. You will see that the area is blocked by some caustic liquid, so instead, drop down the broken floor on the right and head inside to get a Valve. Go back to the area above and use the Valve on the nearby pipe to turn off the caustic liquid blocking the area. Head inside and follow the path to find a battery. Use the battery along with some water to electrocute the nearby enemies and then drop down the platform.

Grab the Circuit Breaker from the nearby control panel and then tread carefully past the toxic fluid to reach an area with the circuit and a locked door. Use the Circuit Breaker to open the gate and proceed to the next area. Use the water jug nearby to extinguish the fire and then defeat the Firefighter. Use the valve to change the flow of the caustic fluid and then use the water pipe to clean the floor. Head past the door at the end of the path.

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Solving The Balance Puzzle

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Here you will need to complete a puzzle to proceed to the next area. Firstly, you need to use the valve in front with 20 written on top of it. Take a right and crouch to go past the gap. You will find a valve with 50 written on top, and use it to make the total pressure 70. Break the wooden crate and head back out of the room.

You need to once again use the valve you used to change the flow and then the water valve to clean the area. Head to the newly cleared area to find the door, and open it to find four zombies. You can either kill them directly or head back and use the flow control valve to kill them with the caustic fluid. One of them is Phil, and after defeating him, you will get the Gate Control Room key.

Head all the way back and use the newly acquired key to open the door which you found earlier in the mission. Go inside and use the switch to open another gate and follow the path to reach a house. Right beside the car, you will find a gap that you can go past to get inside the property. Speak with Sam B and Ronnie and then try to open the door beside him to get the next objective.

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Surviving The Onslaught

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Once you are inside, you will meet a new enemy type in the game, Screamer, in the form of Nikki Gutte. They are really annoying to deal with because their attack summons more zombies, so it is always advisable to take them out first. There is plenty of healing in the area but you need to ensure that you keep moving at all times. If you get caught in a screamer's main attack, you will end up slowing down significantly which can make things quite difficult for you. Defeat Nikki and the minions nearby and proceed into the nearby room.

Grab the Sporting Rifle from the nearby wall, and head upstairs, to grab some ammo. Use your newly acquired weapon to prevent zombies from entering the house. There are a number of explosives in the area which you can utilize to make things easier for you. Eventually, the onslaught will end, and you need to head back to Sam B, to complete the mission and get the Extinction Event along with the other rewards.

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