One weapon can have a Status power(Masamune has countdown Death) or not (Orichalcol)
When you use Zidane's Soul Blade ,he will inflict weapon's status power to the enemy CERTAINLY(if the enemy can't block that Status SURELY).

For example,use Soul Blade with "Masamune" on any non-boss enemy will give that monster a death after 10 second
But id you use Soul Blade with Orichalcol,nothing happen
Soul Blade is a wonderful Skill