TheNamlessGuy said:
Yes, but then they wouldn't be the same, but very similar.
I only use this concept because of my books, just FYI.
I should rephrase then... Mastery of either Darkness or Light automatically gives mastery of the other. Therefore "Darkness and Light" is/are one element... Unless one assigns extended meanings of "Holy" and "Unholy/Profane" so often implied by Light and Dark, respectively.
EDIT: Two sides of the same coin.
I like to reference a nifty system from Might and Magic (specifically M&M7)... might be worth looking into if you're interested. You can also pick up DnD references, GURPS (which is by far the most encyclopedic pencil-and-paper roleplaying game i've ever had the pleasure of reading) books.
Also... What about some bigger metaphysical elements: Time, Space, Gravity (which i suppose is technically related to Earth), Mind (i'm putting that back in because even with the general "all life" definition, there are things not fully covered by Soul imo), and an even more awesome but generic element Energy (which has pieces of everything). Stuff to think about...
BACK OT: I for one, assuming my previous "Air" claim doesn't go through, would love to be a Time master. Time travel, freeze, stop (yes, it's different), haste, fugue (the ability to go back an instant in time and team up with yourself)... awesome.