Chromatic Orbs_PHB

Throw a 4-inch-diameter sphere of energy at a creature that you can see within range. You choose acid, cold, fire, lightning, poison, or thunder for the type of orb you create, and then make a ranged spell attack against the target. the creature takes 3d8 damage of the type you chose if the attack hits.

At Higher Levels. if you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d8 for each slot level above 1st.

2nd level spell slot: 4d8

3rd level spell slot: 5d8

4th level spell slot: 6d8