I looked closer, and you're right. I stand corrected.... at least partially. It does say that the synergy bonuses for Bluff and Sense Motive stack, but I see no mention of Knowledge (Nobility) having a synergy bonus, much less it stacking with the other two.Crothian said:RAW, Synergy bonuses stack.
That being said, though, I still wouldn't allow it in my game. Call it a house rule, but I still think synergy bonuses should not stack. Pick whichever one is most applicable, but only that one. I would allow a synergy bonus for Knowledge (Nobility) if the diplomacy check was for a negotiation with nobles since that does make sense, but I wouldn't let it stack with other synergies.
Edit:
The rule for Bluff and Sense Motive synergy bonuses stacking is a rule specific to the Diplomacy skill. There is no general rule I can find that states synergy bonuses stack. That's a consistency issue with me; I don't believe in exceptions. Synergy bonuses should either stack or not stack across the board.
Last edited: