This spell completely shatters one non-magical weapon, held or not, within spell range. The wizard needs but to chant a word or two while concentrating on the weapon to be destroyed and making a slow crushing gesture with his fist.
If non-magical the weapon explodes with no save. Anyone within 5' of the weapon receives shrapnel damage with an amount dependent on weapon size: T= 1 H.P., S= 1d2, M= 1d4, L= 1d6, H= 1d8. A save for half damage is allowed, except in the case of the wielder (if any), who receives none. This damage could be decreased for those in heavy armor.
Magical weapons have a base 5% chance of exploding per level of the casting wizard, minus 15% per "plus" of the weapon. More may be subtracted for specific or extremely powerful weapons.