Swearing

[Adny]

Is "Shit" too 'new' to be used? As in
*Monster groan*
*Whisper* "Shit"

I think it's less about the language used and more about how it is said; if you can find a dynamite voice actor with tons of emotion, they could say:

*Monster groan*
*Whisper* "Oh Jolly-poppers..."

and it would still make the player feel uncomfortable. Still, "shit" isn't considered one of the classier of vulgar words. It all depends on the time period in which your mod is taking place in; if it is similar to Amnesia (mid 1800-ish), then don't use more recent vulgarities. If it is something more modern, use whatever you'd like, just don't be like Cry of Fear and use f-bombs senselessly and have bad voice acting to boot.

I'd suggest using something like damn or Jesus Christ (not technically a vulgar term, but I've seen quite a few people get butt hurt over that). People from the 1800's love them some religion, anything pertaining to that could work. Dialogue is a critical part of building up your character (assuming you want them to talk at all); just stay within the time period, and keep it consistent.