Oath

Regular; Special Resistance 
Similar to Great Geas (VH), but works on a willing subject only. Although the caster casts the spell, the subject must speak the oath. 
The subject may knowingly attempt to break his oath (rolling vs. Will) no more than once per day. The spell resists the attempt; if the subject overcomes the resistance, he manages to break the oath just this once. A critical success by the subject or a critical failure by the spell breaks the spell. 
The spell may otherwise be broken only by Remove Curse. 
Unknowing attempts, such as when the subject is tricked into breaking his oath, are not Resisted by the spell.

Duration: Permanent. 
Cost: 4 
Time to cast: 1 minute. 
Prerequisites: Magery 1 and Emotion Control.

Item 
Jewelry. Always on; only affects the wearer.  
Energy cost to create: 550.