The facts of the universe are these:

"To every good, there is an evil. To every light, there is a shadow. The Voices are charged with making certain that the balance is kept, because if it's thrown off-kilter, then the bad overwhelms the good. Things that thrive in the dark, spread. The good dies and is left to rot. With rot comes disease over the realms, and returning Jaydür to a place of peace would be near impossible."