'The result of magic in warfare, if properly and expertly done, is that it seems as if magic did not exist at all.' --- First Wizard Zorander

Spells in naval warfare are a tricky thing, as each side tries to punch through the other's defenses. Sometimes it is easier to weaken a shield than it is to utterly destroy it, and that is where this spell comes in. It will not destroy even the weakest of shields, but it will make even the strongest of defenses weak, allowing other attacks to penetrate what they could not before.