Chromatic Infusion

You infuse your melee weapon with elemental energy. You choose acid, cold, fire, lightning, poison, or thunder for the type of energy you infuse, and for the spells duration the next melee weapon attack you make, if the attack hits, the creature takes 2d6 damage of the type you chose. Once you deal damage this way the spell ends immediately. 

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.