Better Flame Arrows

You touch up to 12 pieces of ammunition. When a target is hit by a ranged weapon attack using one of these pieces of ammunition, the target takes an extra 1d6 fire damage. The spell’s magic ends on the piece of ammunition when it hits or misses.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the number of pieces of ammunition you can affect with this spell increases by two for each slot level above 3rd. At 5th, 7th, and 9th level the damage also increases by 1d6.