DESC: Bluff is a root skill. It is used to make an observer believe in what you want them to believe pending a successful roll. This is not just limited to the things you may say, but also the things you may do.

A DM may modify either side of the challenge depending on circumstance. The target may have a deep hatred for the user resulting in a +5 for the target, or the user may have a reputation for honesty and fairness giving him a +5.