The field of philosophy (not including science) that deals with things other than matter and energy would be metaphysics.
There are 2 kinds of metaphysics, general and special.
I will first explain the general metaphysics.
General metaphysics: The study of ultimate realty as in the big picture of reality and is done empirically by most contemporary philosophers. Items of study in general metaphysics are categories, universals, attributes etc.
Special metaphysics: Special metaphysics has potentially an infinite number of sub branches, each studying one particular subject. One such subject may be ghosts and spirits but most contemporary philosophers don't take this particular subject matter seriously.
