Controlled Fireball

Evocation [fire, ruse]
Level: Artificer * 4, Bloodrager * 4, Magus * 4, Sorcerer */Wizard * 4
Components: V, S, M (a ball of bat guano and sulfur)
Casting Time: 1 Standard Action
Range: long (400 ft. + 40 ft./level)
Area: 20-foot-radius spread
Duration: instantaneous
Saving Throw: Reflex half
Spell Resistance: yes
  A controlled fireball spell generates a searing explosion of flame that detonates with a low roar and deals 1d6 points of fire damage per Caster Level (maximum 10d6) to every creature within the area.
  Unattended objects also take this damage. The explosion creates almost no pressure.
  You point your finger and determine the range (distance and height) at which the fireball is to burst. A glowing, pea-sized bead originates from any point you can see within range of the spell, then streaks to its target and, unless it impacts upon a material body or solid barrier prior to attaining the prescribed range, blossoms into the fireball at that point. An early impact results in an early detonation. If you attempt to send the bead through a narrow passage, such as through an arrow slit, you must "hit" the opening with a ranged Touch Attack, or else the bead strikes the barrier and detonates prematurely.
  You can choose a number of squares within the area up to your casting ability score bonus to be struck by weaker flames; the controlled fireball deals minimum damage in those squares. Attempts to identify controlled fireball with a skill check incorrectly identify it as a fireball spell. See Ruse Spells for more details.
  The fireball sets fire to combustibles and damages objects in the area. It can melt metals with low melting points, such as lead, gold, copper, silver, and bronze. If the damage caused to an interposing barrier shatters or breaks through it, the fireball may continue beyond the barrier if the area permits; otherwise it stops at the barrier just as any other spell effect does.