Trophy Description: In Zetsubou No Shima, kill 10 zombies with a shot of KT-4 Wonder Weapon.

Trophy Type: Bronze.

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To build the KT-4 you must find 3 pieces and put them together at a workbench. Their locations are as follows:

Part 1: Where you turn on the power there's a cage you can lower down. This only works after turning on the power (bring irradiated water in a bucket to start the generator). Lure a spider into this cage and bring the cage back up. Some blood will be drained from the spider which counts as a part for this weapon.
Part 2: Inside the bunker open the door in the middle and go down to the lab. There's another door at the side you can open and swim down a cave. At the very bottom there's an aquatic plant you must pick up. Shoot the yellow bubbles on the walls to replenish oxygen. Be quick or you'll drown!
Part 3: This one is randomly dropped by a zombie sometime between round 7-12 after permanently turning on the power in the bunker. The zombie with the item will be glowing green, but it's hard to see. He drops the item when you kill him. Interact with it to pick it up.

Now you can build the KT-4 in the lab of the bunker (corner of the room). To get the trophy you will want to have a lot of zombies running after you. Just run in circles and stay in one area. Then charge up a shot by holding down R2 (PS4) / RT (XB1) and shoot on the floor. This will create a pool of acid and the zombies get killed when they walk through it. The acid stays there for a few seconds. Only fire one charged shot, if you fire multiple shots it might not count.
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