Divine Charisma

The angelic spark inside you combined with the devotion to your paladin oath makes your very presence one that is (and perhaps should be) noted by all you engage with, as if a true divine being walks among them. You gain the following benefits:

• You gain proficiency in the Persuasion or Intimidation skill. If you are already proficient, you gain expertise instead. 
• Celestials and Fiends often look down upon the races of the Material plane, regarding themselves superior in their actions and judgement, to all but you. You gain advantage on Charisma Checks against Celestials and Fiends. 
• Once per long rest, you can cast the Calm Emotions spell centered on yourself while your Channel Divinity: Emissary of Peace is active.