It's not a "magical frequency". It's the balance that exists - and it does exist - between all things. In the light, there are shadows and only light can chase shadows away. If your world is composed only of light or only of dark, you must come from an interesting...or miserable...place.

[He snorts.] The gods use us. That's old news. My focus has been on keeping myself and others safe. We don't have much control over gods.