This is super-revealing, and super-important:
Code:
+Se/-Si <> Cosmic/Darkness
-Fe/+Fi <> Light
+Si/-Se <> Earth/Fire
-Fi/+Fe <> Water/Illusion
-Ti/+Te <> Air
+Ti/-Te <> Gravity
-Ni/+Ne <> Psychic/Lightning
+Ni/-Ne <> Time/Holy
Imagine you were a sorcerer; You would be able to cast spells of a determined domain depending on your proficiency with said Element.
The most powerful spells are +Se/-Si spells. +Se/-Si trumps all the other elements in a tier battle. This is because god (the god that has the final say - not the only god) is the lord of +Se/-Si. The Trinity gods are the lords of -Fe/+Fi (Light), +Se/-Si (Cosmic/Darkness), and +Ni/-Ne (Time/Holy), respectively.
Example: