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u only need to rebuild a specific number of barriers on the windows and a green cloud will pop up!!
this makes u reinforce ur barriers, in other words: a zombie trys 3 times to take out 1 piece of wood!
add this to the quick revive perma perk and the headshot perma perk.
This is legit My mate was just boarding up a window on TranZit, and the character said "This Could Be Useful" and said that the Zombie took 3 attempts to pull down a window!
Yea I can confirm this as well after looking at the boards. Look at the board length wise and on the top and bottom there will be metal strips. If those are there then you have the perk and it will take zombies longer to brake the boards down.