I swear fealty unto you, lady/lord. Your command is my desire and your request my desire. May my service always please, and may my sight grow dark if it does not. As the tides to the moon, my will to yours, my liege.
This is the wording of the formal Oath of Fealty, usually used at investitures, knightings, and Sainings. To speak the words of this oath requires spending one point of willpower and a formal obeisance (such as prostration before the liege) that lasts at least a full quarter of an hour.
Once the oath is taken, all resistance rolls against mental domination have their difficulties reduced by 2. Breaking the oath causes the loss of 3 willpower points. In extreme cases of betrayal the offender may be struck blind for a year and a day.