Spell levels from greatest to least
—- —- —-
Sacred
Godly
Sage
Grand Lord
Great Master
Master
Knight
Adept
Novice
Base
—- —- —-
All beings of the worlds can use any principle but the PLANET they are born on is the one they will excel at the fastest but doesn't mean it will be the strongest. Spells within a discipline are created solely on how the user needs or imagines it.
For example
Someone trying to master the principle of Fire
May create a spell called Fire blast which is an adept spell. It is simple enough but later it could become a spell called Tri Fire blast which is a Master spell.
There is preset spells in each principle as each planet needs a foundation but from there it is all dependent on the magic user.