A world at the mercy of a mad Solar Deity
Created by the god of madness, one must be at least a little insane to be able to use them. These tools cause much confusion to those that see them in action and are guaranteed to cause misunderstandings.
Believable magic, like ordinary physicis, operates according to some invariable laws that always result in some kind of cost or "bounce back". The grater the magic, the more it should cost the character physically, emotionally, and spiritually.