GLIBNESS - Transmutation - 8th Level

Casting Time: 1 Action
Range: Self
Components: V
Duration: 1 hour

Until the spell ends, when you make a Charisma check, you can replace the number you roll with a 15.  Additionally, no matter what you say, magic that would determine if you are telling the truth indicates that you are being truthful.

Class List: Bard, Warlock.
Source: 5th Edition SRD, Player's Handbook