Each element has a weakness and a strength.
Fire → Ice → Wind → Earth → Thunder → Water → Fire
Additionally Dark ← → Light are opposed elements.
Or, if you like lists:
- Fire melts Ice
- Ice blocks Wind
- Wind erodes Earth
- Earth grounds Thunder
- Thunder shocks Water
- Water douses Fire
- Light illuminates Dark
- Dark eclipses Light
Certain weapon skills have elemental properties, as well.
Ex: Red Lotus Blade > Fire
See also:
Weather
Ninja: Elemental Wheel
Calculating Magic Damage