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Mysterious Serum Adds Fatigue and Suppresses Immunity: because of COURSE they have to take the best radiation item in the game and make it completely useless. : r/fo4
![Mysterious serum - The Vault Fallout Wiki - Everything you need to know about Fallout 76, Fallout 4, New Vegas and more! Mysterious serum - The Vault Fallout Wiki - Everything you need to know about Fallout 76, Fallout 4, New Vegas and more!](https://static.wikia.nocookie.net/fallout_gamepedia/images/a/ae/MysteriousSerum.png/revision/latest/scale-to-width-down/320?cb=20180710234828)
Mysterious serum - The Vault Fallout Wiki - Everything you need to know about Fallout 76, Fallout 4, New Vegas and more!
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