You stare at a creature witheringly, the creature must make a Wisdom Saving Throw (DC: 15), if the creature fails it takes 6d8 damage and it becomes frightened of you, if the creature passes then it's not frightened of you but takes half damage.

If the creature is frightened of you then every turn it must make a Wisdom Saving Throw (DC: 15) if the creature fails it's still frightened of you and must make the save again next turn, if the creature passes then it's no longer frightened of you.