8th-Circle Arcane and Divine (Transmutation)
Casting Time: 1 action
Range: Self
Components: V
Duration: Concentration, up to 1 hour
Until the spell ends, when you make a CHA ability check or save, you can replace the number you roll with a 15. In addition, no matter what you say, magic that would determine if you are telling the truth indicates that you are being truthful.