kk14 said:
Is it possible to bluff PCs? or is it all by the DM? can a PC bluff or diplomacy another PC into not attacking, or otherwise changing their courses of action? My friend says that PCs can do whatever they want, and so cannot be bluffed either by each other or by the NPCs.
Diplomancy cannot be used against a PC, they are free to act as they choose (cannot be influenced). To negotiate a treaty in their favour against the PC's diplomancy I'd allow (an interpretaion of it not being used "against" the PC's).
There is nothing rules wise that says a PC cannot be bluffed, however they can still do what they like (within certain limits).
"I'm no threat to you" Bluff: If NPC wins, NPC appears harmless/threatless, but PC can still do as they please.
Trustworthy: If NPC wins, appears trustworthy but PC can still do as they please
Feinting in Combat: Go as per the rules, PCs can be feinted
Creating a Diversion to Hide: Go as per the rules, PCs can be diverted.
Delivering a Secret Message: Go as per the rules, PCs can be oblivious or missunderstand.
Having said that, the player should still portray the PC in a consistent way. If they don't have any reason to beleive that someone is out to get them, they should act accordingly.