Perdo
One of the fifteen Hermetic Arts, Perdo is a Technique used in Hermetic Magic intended to destroy or degrade its target.
Perdo cannot improve something, moving it closer to its ideal form - thus, Perdo can be used to serrate a sword, but not to sharpen it.
Changes caused by predition often persist naturally, as the destroyed qualities usually don't resume by themselves. For example, a pit dug by magic will not naturally fill so remains empty. In contrast, a person turned weightless by removing his quality of possessing weight through perdo will regain his weight once the magic ends.
Notable traditions and magi
Apromor, first filius of Flambeau the Founder, in contrast to his pater, favored perdo over ignem for the former's versatility as well as for it's ability to more easily avoid collateral damage. the School of Appromor is one of the two most popular schools of combat in the House, beside the School of the Founder.