Rule: Purviews
Purviews represent areas of expertise you have developed over the years. They are a combination of instinct, skill and general know-how. You find things related to your Purviews easier to accomplish (e.g. hiding in shadow or understanding how a mechanism work).
Anytime you make a Check that falls under one of your Purviews, you can ask your DM for a Minor Bonus (+2) to your roll.Your DM will decide whether your Purview is applicable to the roll.