Primal pyromancy taught by Quelana of Izalith. Erect fire pillars in vicinity.Short article on a slightly unpredictable spell inspired by Dark Souls that does a lot of damage if one is lucky. Let's take a look.
The storm of flame is indiscriminate, and incinerates all nearby life.
MechanicsSo, first off this attack does a lot of damage, and that is pretty easy, and it is not very reliable. This sounds like an Overhead (Which can be used as a substitution for an attack that occurs under a target as well) Area of Effect (Happens in a uniform area,) Emanation (With the caster at the middle) and Bombardment (Pretty random whether it hits or not.) If we put these all together we get:
Firestorm (+75%): Innate Attack (Burning) 3 (Sorcery -15%; Area Effect, 4 yards, +100%; Emanation, -20%; Bombardment, Effective Skill 8, -20%; Overhead, +30%) 
OK, so the spell costs 26.25 (rounded up to 27) character points for a default level of 3, and 8.75 (rounded up to 9) character points for a level beyond that (If you like that kind of thing. In the Sorcery write-up format, this looks like: