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Metaphysics:
met·a·phys·ics (mět'ə-fĭz'ĭks) Pronunciation Key
n.
1. (used with a sing. verb) Philosophy The branch of philosophy that examines the nature of reality, including the relationship between mind and matter, substance and attribute, fact and value.
2. (used with a pl. verb) The theoretical or first principles of a particular discipline: the metaphysics of law.
3. (used with a sing. verb) A priori speculation upon questions that are unanswerable to scientific observation, analysis, or experiment.
4. (used with a sing. verb) Excessively subtle or recondite reasoning.

The Nature Of Reality
That Which Goes Beyond Physics
Physics is the study of the physical, physical laws and properties. Physics is the study of that which we can sence. It is the study of that which we interprete and the meanings of such.

Metaphysics is the WHY
Metaphysics is the study of why Physics is the way it is
Metaphysics is that which Physics can't EXPLAIN

But Metaphysics Can Explain Physics
Metaphysics Can Explain that which happens that Physics Can't

So the First Devision we must make is the devision of what Can and Cannot be explained by physics

Next: There are two branches concerning the Study of metaphysics
~ One Examines Affect On Physicality
~ One Examines the Affect On that which isn't physical

So the two catagories are...
The interaction of that which isn't physical on that which is physical
And
The interactions of that which isn't physical on that which isn't physical

All forms of magic fall into these two catagories

Spirit Based Magic