Insight determines whether you can discern true intentions, such as when searching out a lie, discovering hidden motives, or predicting someone’s next move, gleaning clues from body language, speech habits, and changes in mannerisms, and putting together small clues and fragments of information to understand the bigger picture.
Discern Deception
Insight opposes Deception checks. Whenever a character makes a Deception check to lie or feint in combat, you are entitled to an Insight check to oppose their deception.
A successful check can also reveal someone attempting to deliver a secret message. If you beat their Deception check by 5 or more, you intercept and understand the message.
Hunch
This use of the skill involves making a gut assessment of the social situation. You can get the feeling from someone’s behavior that something is wrong, such as when you’re talking to an impostor. Alternatively, you can get the feeling that someone is trustworthy. The DC for getting a hunch is usually 20.
Sense Enchantment
You can tell that someone’s behavior is being influenced by an enchantment effect, even if that person isn’t aware of it. The DC is usually the same as the save DC of the enchantment.
Gather Information
You can use Insight to gather information about a specific topic or individual and put together disparate clues to get a better understanding of the information. To do this, you must spend at least 1d4 hours canvassing people at local taverns, markets, and gathering places.
The DC of this check depends on the obscurity of the information sought, but for most commonly known facts or rumors it is 10. For obscure or secret knowledge, the DC might increase to 20 or higher.