Glibness

8th-level, Transmutation

• 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.

Classes: Bard; Warlock

Source: Player’s Handbook p. 245. Available in the SRD