Arcane dart

You hurl a dart of energy at a target within range. Make a ranged spell attack against the target. Shields don't provide any armor class bonus against this attack roll. On a hit, the target takes 3d6 Force damage.

If you roll the same number on two or more of the d6s, the dart pierces through the target and streaks towards another target in a 60 foot cone. Make an attack roll against the new target, and make a new damage roll. The orb can’t pierce through another unless you cast the spell with a level 2+ spell slot.

Using a Higher-Level Spell Slot. The damage increases by 1d6 for each spell slot level above 1. The orb can pierce through a target maximum number of times equal to the level of the slot expended, and a creature can be targeted only once by each casting of this spell.