This is a Divine Aura
You and friendly creature within 10 feet of you can't be frightened.
Additionally whenever you or any friendly creatures within 10 feet of you score a critical hit or reduce a creature to 0 hit points, the creature gains temporary hit points equal to 1d6 + your Charisma modifier (minimum of 1 temporary hit point).
The creature's target must also succeed on a Wisdom saving throw against your spell save DC or be frightened of the creature until the end of its next turn.