Death Blade

You pull a dead soul from the ether to temporarily enchant your blade. Until the end of your next turn, a chosen bladed weapon within range gains +2 to its attack and damage rolls. Additionally, any creature struck by the weapon must make a Wisdom saving throw or be frightened of you until the start of their next turn.

The bonus to Attack and Damage rolls increases by 1 at 5th, 11th and 17 levels.