The implications of his deception score

[Ex Machina]

A convention in my game is that any score of 3 or higher indicates a level of expertise that will come with a degree of reputation or infamy. If you are +4 you will be known for that thing, and +5 your fame will follow you. This won't probably be an advantage. a +4 gun combat character will be challenged to gunfights, a la old west gunfighters.
In the last game I began a character acquired a deception 4 skill. It hasn't come into play yet, and I'm not sure yet what it makes that character. Who are you if you have deception-4? And, who knows about this skill? The answer is probably nobody, since you are so good at deception.
In play, what actions are you able to take with such a high deception score? This is well out of the range of convincing the customs agent not to check your bag.

 

[kilemall]

Part of the art is settling what the skill means and does.

I favor powerful comprehensive skills, not cascading specialty. So Deception presumably means the sort of alteration of identity and character that a spy or con man would use. The primary skill of say a Mission Impossible team member.

But I expand it to mean the psychology of masking and misdirection.

So I use it for camouflage, a sort of negative use of Persuasion, Forgery, and the foundation skill of acting.

 

[Condottiere]

First of all, you avoid letting anyone else know that you have the Deception skill.

Then the deceiver layers the deception with things that are actually true.