Oathkeeper(Su): A marshal can call upon powers greater than themselves in order to sanctify and bind oaths sworn willingly. Some call on demon princes, some on gods and some invoke the concept of justice itself but the results are the same. When you observe an oath, formal promise or vow made willingly between two creatures (Including yourself) you may spend 1 resolve as a free action (Even if it is not your turn) in order to sanctify the oath. If either party breaks the oath, then it is annulled and the party that broke it suffers a terrible curse.

The next time they are in  dangerous situation of great personal importance (GM’s adjudication. A life or death fight is generally applicable but tense negotiations for example may also apply if the results of failure are serious enough) they will need to roll twice and take the lower roll with every roll they make for the duration of the scenario. In addition, anyone they target with an ability may roll twice and take the higher result on any rolls to resist the action. This occurs in the next two such situations at 13th level and in the next three at 18th level.

A character may choose to make a will save (DC 10 + ½ Level + Cha Mod) in order to resist the creation of the oath but, if successful, all parties become aware that the oath was not agreed to in truth. A character cannot be bound by the oath if they are not in full control of their own mind or if they do not understand the oath they are swearing.