Essentially yes and thank you. I do understand, but I did believe that that was the case. I actually considered the idea after looking at the most common magic types, specifically what was being affected and how. I looked at the common evocation based magic types and broke down two principles of them; pressure and movement. Sound, at it's core, is made up of pressure and displacement/movement. From what I read an evoker's powers followed the same principles as well. The case of water stuck out to me in particular. They can create, move, and control the pressure of it. This is a quote from the Guide for Magic Canon: I tried to make it follow the principles that I read in the current magic lore. Accessibility is the same as others presumably. However accessibility to understand and study sound is much more common than even the elements possibly. Sound is all around beings of the realm, in variations as well. As far as it being the unnoticed hole, I assumed that was the case. As I posted above, it is essentially two principles present in all evocation types. The difference being the intended result. In this case the user isn't trying to move something so much as change it's pressure and resulting displacement. This was some of my thinking behind the idea.