Chill Blade

You make a single melee weapon attack against a creature you can see within the spell's range. If the attack hits, the target is surrounded by magical energy plus the normal effects of the weapon's damage. The magical energy prevents the target from healing until the start of your next turn. If you hit an undead target, it also has disadvantage on attack rolls against you until the end of your next turn.

This spell’s damage increases when you reach higher levels. At 5th level, the melee attack deals an extra 1d8 necrotic damage to the target. The damage roll increases by 1d8 at 11th level and 17th level.