Using this spell a caster is able to dump raw magical energy into someone else just as they are beginning to cast a spell or use a magical device.

Greater Disrupt Magic works just like Disrupt Magic with one notable exception. Unlike Disrupt Magic, the caster of the Greater Disrupt does not need to know the sphere of the spell they are targeting. They simply draw forth pure arcane power to disrupt any spell.

You must have at least one Disrupt Magic to meet the pre-requisite for this spell. Since Disrupt Magic is bought for each sphere targeted.