So one of my characters is attempting to fool an NPC adversary (treating it as a persuade) test.
I understand the TN is derived by subtracting his wits score from a base 20, which, in this case, equals 16.
I'm...baffled, though, at how un-nuanced the game system seems to be with respect to adjusting the TN based on a task's difficulty. For example, the same TN would apply regardless of whether the character were attempting to convince an old friend who was a town guard to "look the other way" for letting them through the gate after hours, vs. attempting to convince a highly suspicious villain who was given explicit instructions not to trust anyone.
So I've read through the main rulebook and I don't see any guidelines for adjusting a TN up or down based on how easy it is. The closest thing I can find is "complications" for Combat tasks but there don't appear to be anything for social/diplomatic encounters.
Thoughts?