Curse Bringer

You can create a greatsword forged from silver, with black runes etched into its blade, using your Pact of the Blade feature. If you reduce a target cursed by your Hexblade’s Curse to 0 hit points with this sword, you can immediately change the target of the curse to a different creature. This change doesn’t extend the curse’s duration. When you hit a creature with this weapon, you can expend a spell slot to deal an additional 2d8 slashing damage to the target per spell level, and you can reduce the creature’s speed to 0 feet until the end of your next turn.