I've read D&D 3.5 core books and haven't found anything useful in such a scenario - a player is approaching an unaware opponent (for instance with a dagger) and is trying to kill him by cutting his throat. Is there any specific rule on that? I suppose it would be weird to initiate a normal combat in such conditions.
I know the Rogue's Sneak Attack, but what with other classes? And even with this very ability it just adds some additional damage, but, correct me if I'm wrong, cannot kill the target instantly.
Can you recommend me any book containing rules for such encounters or help me find an appropriate rule in any of the core books (I'm interested in RAW rules in the first place)?
Thank you very much for your help and sorry for troubling you if I overlooked something.