Tori groaned at the question, knowing Kalinda would sprout it off as if she had swallowed the text book. 

"A Souls are an individuals own spiritual essence, and as such are a immaterial part of their make up. They help show a persons...personality. How they wavelengths work, and how they can pair and bond with a weapon. Each souls has its own sort of energy wave, and this is the Soul Wavelength. You can consider it a frequency. You can have different strengths of wavelengths, depending on how strong and big the soul is as well as the health of the person. Some people can actually see soul and their wave lengths. Some people can also use their soul wave length as an attack, letting them have a unique style of fighting with their weapon. A Miester and Partner can only become sufficient partners is their is a link betwein their wavelengths, and they must match. A simple way of explaining it is...The sound (soul wavelength) that comes from an electric guitar (Meister) by itself is rather faint...but when you connect an amp (Weapon) to it, the soul wavelength is amplified, giving it a lot of power.

Soul reasonable however is a special technique used by Meisters and Weapons, in which, they synchronize their Souls wavelength. By doing so, they can release highly powerful techniques and, more often than not, change the tide of a battle. But it only works effectively if a miester and
Weapon are totally in sync"