My spells almost always cover protection of large areas, such as households, or matters of healing. I only intend the books to be used by those who wish to learn, if they are worthy, they will find the books, and they will learn all they need. At the start of every book I have written three things to remember.
Magic can not do everything in this world. Everything is limited, this world, magic you, know these limitations and find ways to win anyway. That is how to play a game.
Never rely on black magic where white magic fails you, in the long run black magic makes you even more of a failure. For it proves that you were to weak to walk the wise path.
Finally never take a rule to be a law, the rules in these books, the rules that science tells us, are only ever guidlines. (But some guidelines are there for good reason. Remember the Law Of Three)