You hurl a small mote of abyssal energy, making a ranged spell attack, dealing 1D8+your spell modifier in damage to a single target. The type of damage is determined by the number rolled on the D8, as shown below.

At Higher Levels: The damage increases by 1D8 at fifth level,  2D8 at 11th and 3D8 at 17th for a total of 4D8+spell modifier damage. The damage for each D8 is separate; it is possible, even probable, the damage will be of multiple types from the same bolt. You select which damage type your spell modifier does from the damage types rolled on the D8s.

1:  Acid

2: Cold

3: Fire

4: Force

5: Lightning

6: Poison

7: Psychic 

8: Thunder