Persuasion

If you have a shop in your campaign, get ready to haggle. Persuasion is the skill used to see how charming and cordial a player seems. If your player wants to convince someone to do something that is either not obvious or would not be their own idea, this skill comes into play. It has a wide variety of uses beyond just talking to shop keeps. You can bribe guards, you talk a person off a ledge, you can get past that bridge troll. All of this and more can be done with persuasion!