Fireball

School pyromancy (spell) [fire]
Action 1 standard
Range long (400 ft. + 40 ft./tier)
Area 5-ft. radius burst
Duration instant
Save Dexterity

You shoot a tiny projectile of magical fire that flies under your control to any point within line of sight and within range. Upon reaching your desired location, the projectile explodes into a ball of fire. All creatures and flammable objects in its area take a number of fire injuries equal to your cultivation modifier. Creatures are also knocked prone. A successful save halves the number of injuries and avoids falling prone.

Refinements

Delayed (+1)

Your art's duration changes to a number of rounds equal to your cultivation modifier + 1 round/tier. After your projectile reaches your desired location, you can choose to explode it at any time on your turn as a simple action during its duration, which ends the art. You do not need line of sight of the projectile to detonate it after your had cast it. Once the projectile reaches its destination, it cannot be moved. The projectile is visible, and can be targeted to be dispelled. A successful attack on the projectile detonates it (DV 10). At the end of its duration, the art explodes as normal.

Empowered (+1)

Increase the number of fire injuries inflicted by 1.

Expanded (+1)

Increase the art's burst radius by an additional 5 ft.

Selective (+2)

You may choose omit a number of targets equal to your cultivation modifier in your art's area of effect from receiving fire injuries.

Shockwave (+1)

Your art also shoves targets 5 ft. away from the center of the fireball's explosion. A successful save negates being shoved.