Entitled Fallout: The Frontier, this mod swaps Los Vegas for Portland, bringing a nuclear winter landscape to proceedings This has been put together by a group of 50 people, and is aiming to hit this 'winter'.
Take a look at the trailer here:
https://www.youtube.com/watch?v=ocoh3irLha4Video can't be loaded because JavaScript is disabled: Fallout: The Frontier Premiere Trailer (https://www.youtube.com/watch?v=ocoh3irLha4)
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