Charge

You imbue a creature with an electric charge. Choose a creature within range. For the duration of this spell, whenever another creature hits the target with a melee attack, that creature must make a Dexterity saving throw, taking 1d6 lightning damage on a failed save or half as much on a success. If the melee attack was made with a metal weapon such as a [equipment]spear[/equipment] or [equipment]rapier[/equipment], the creature has disadvantage on its saving throw.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d6 for each slot level above 1st.