They may also become openly hostile despite your reputation with them not being lowered enough for you to be considered hated where they will attack you. However, it does still exist and if someone catches you performing an action that causes negative Karma against their faction you will often lose reputation with that faction for example, stealing something from The Silver Rush where a Van Graff can see you. Karma doesn't have as much of effect on gameplay as in Fallout, Fallout 2 and Fallout 3, since reputation has a more important place. You begin the game with a value of zero, which increases or decreases based on the players actions. 4.3 To decrease karma to Evil or Very Evil.4.1 To increase karma to Good or Very Good.