Weapon of Frightening Restraint

From - Asterik's Astounding Atrocities | https://www.dmsguild.com/product/257882/Asteriks-Astounding-Atrocities--50-New-Magic-Items

You have a +1 bonus to attack and damage rolls you make with this weapon.
Whenever you roll minimum damage on a damage roll made with this weapon, the target of your attack must make a DC 13 Wisdom saving throw. On a failed save, the creature becomes frightened of you until the end of its next turn.

Rarity

Weapon (any), rare (requires attunement)