Experimental Strike

While you could attempt to maximize damage immediately, you decide to take a more measured approach with your attack. You create three gleaming motes of magical energy. Each mote deals a different kind of damage; slashing, piercing, and bludgeoning. Make a ranged spell attack for each mote, with advantage on each roll. You must direct each mote at the same target, and on hit, each mote deals 2 damage to its target. 
On hit, each mote briefly releases a spark of color before dissipating, indicating if the target has resistance (yellow spark), immunity (red spark), vulnerability (green spark), or no special interaction (blue spark)with this damage.
Additionally, as you level up, you gain access to new damage types you can use when casting this spell. Upon reaching level 5, you have access to poison, cold, and fire damage. Upon reaching level 11, you have access to acid, thunder, and lightning damage. Upon reaching level 17, you have access to force, psychic, radiant, and necrotic damage. When you cast this spell, you may choose what damage type each of the three motes will deal from the damage types you have access to, but they all must be different from one another. 

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the spell creates one more mote for each slot level above 1st.