This spells is one of great destructive potential. It can be cast in three different forms, and when it is prepared, it is prepared as one of the three forms (it can be prepared multiple times for a day, with a different form prepared each time). 

Salvo. Select three targets within 60 ft. and within a 20 ft. radius of each other. Make a ranged spell attack against each target. On a hit, the target takes 4d4 fire damage and all creatures within a 10 ft. radius of the target must succeed on a Dexterity saving throw or take 2d4 fire damage, taking half damage on a successful save (the target does not make this saving throw). On a miss, the target and all creatures within a 10 ft. radius of the target must succeed on a Dexterity saving throw or take 2d4 fire damage, taking half damage on a successful save. The fire spreads around corners. It ignites flammable objects in the area that aren't being worn or carried.

Beam. A 100 ft. long, 5 ft. wide beam of fire roars forth from you. All creatures in the line must make a Dexterity saving throw. A creature takes 12d4 fire damage on a failed save, or half as much damage on a successful one. The fire ignites flammable objects in the area that aren't being worn or carried.

Blast. A bright streak flashes from your pointing finger to a point you choose within range then blossoms with a low roar into an explosion of flame. Each creature in a 20 ft. radius must make a Dexterity saving throw. A target takes 12d4 fire damage on a failed save, or half as much damage on a successful one. The fire spreads around corners. It ignites flammable objects in the area that aren't being worn or carried.

At Higher Levels. For each level cast about 3rd, the effects of Zaprix's Fusillade of Fire change in the following ways:

Salvo. For every second level of spell slot used to cast Salvo above 3rd, an additional target can be selected and another shot is fired (four at 5th, five at 7th, six at 9th).

Beam. For every level of spell slot used to cast Beam above 3rd, the beam deals an additional 2d4 fire damage. 

Blast. For every level of spell slot used to cast Blast above 3rd, the blast deals an additional 2d4 fire damage.