Whether it is Water, Fire and Earth from the nature; or Light and Dark from Gods and Demons. All Attributes are mutually exclusive.
Taking the advantage of opposing Attributes, clearing up enemies becomes much easier.
Exclusive in nature
Water quenches Fire; Fire incinerates Earth; Earth eases Water; while Light and Dark are mutually exclusive. Attack will be doubled by dissolving the opposing Attribute, otherwise the attack power will be halfed.
The nature of opposing Attribute strikes a balance between the power of Dark and Light.