Oath of Confidence
The Oath of Confidence is a magical oath undertaken by all members of the Shining Blade, beyond the rank of recruit, such as Exemplars. It was conceived by Master Exemplar Livia after the Krytan civil war to prevent a repeat of Markis' betrayal. She bound the ritual to The Shining Blade, an ancient sword gifted by the Seers to be used to slay the last of the mursaat.
Those who undertake the Oath of Confidence are incapable of talking about secrets of the Shining Blade to people who have not taken the oath under the penalty of death. This does not bind an individual to follow the orders of the Shining Blade, however, and not include talking about the Oath itself.