"Sanderson's three laws of magic are creative writing guidelines that can be used to create magic systems for fantasy stories:
An author's ability to solve conflict with magic is directly proportional to how well the reader understands said magic. 20 »
Weaknesses, limits and costs are more interesting than powers. 21 » 82 »
The author should expand on what is already a part of the magic system before something entirely new is added, as this may otherwise entirely change how the magic system fits into the fictional world. 22 »
Additionally, there is a zeroth law:
Always err on the side of what's awesome. 83 » "