When you take this oath at 3rd level, you gain the following two Channel Divinity options.
Emissary of Peace
You can use your Channel Divinity to augment your presence with divine power. As a bonus action, you grant yourself a +5 bonus to Charisma (Persuasion) checks for the next 10 minutes.
Rebuke the Violent
You can use your Channel Divinity to rebuke those who use violence. Immediately after an attacker within 30 feet of you deals damage with an attack against a creature other than you, you can use your reaction to force the attacker to make a Wisdom saving throw. On a failed save, the attacker takes radiant damage equal to the damage it just dealt. On a successful save, it takes half as much damage.