The karma system was noticeably absent from Fallout 4, and while I admit it wasn't for everyone in previous games, I love how it integrates with faction reputations in New Vegas to create a truly reactive world that always feels receptive to your choices. If you've ever wondered what karma would look like in The Commonwealth there's a new mod just for you, and you can even adjust the parameters of the system yourself.
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Fallout is so popular its biggest mod site is crashing due to demand