From Ars Magica
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Creates a projectile that moves forward from the caster. On impact, living entities within the radius (Casting Mode + 1) are attacked for [(Casting Mode^3) + 4] damage, and set on fire for (Casting Mode * 3) seconds. The spell does both fire and explosion damage.
Also, all blocks within the sphere defined by radius (Casting Mode + 1) around the impact point are destroyed with a chance to drop as an item.
(Casting Mode^3) + 4